DataOfWorld

Browse source-attributed reference data

Air quality

1,261 published records. Each page names its source and applicable date.

San Benito County, California

US | 44 | Good | 2026-04-30T00:00:00+00:00

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San Bernardino County, California

US | 3 | Good | 2026-05-01T00:00:00+00:00

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San Diego County, California

US | 7 | Good | 2026-05-29T00:00:00+00:00

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San Diego-Carlsbad, CA

US | 7 | Good | 2026-05-29T00:00:00+00:00

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San Joaquin County, California

US | 48 | Good | 2026-03-31T00:00:00+00:00

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San Jose-Sunnyvale-Santa Clara, CA

US | 44 | Good | 2026-04-30T00:00:00+00:00

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San Juan County, New Mexico

US | 58 | Moderate | 2026-04-30T00:00:00+00:00

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San Juan County, Utah

US | 49 | Good | 2026-04-30T00:00:00+00:00

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San Juan-Carolina-Caguas, PR

US | 19 | Good | 2026-03-31T00:00:00+00:00

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San Luis Obispo County, California

US | 53 | Moderate | 2026-03-31T00:00:00+00:00

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San Luis Obispo-Paso Robles-Arroyo Grande, CA

US | 53 | Moderate | 2026-03-31T00:00:00+00:00

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San Miguel County, Colorado

US | 15 | Good | 2026-04-30T00:00:00+00:00

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Sandoval County, New Mexico

US | 46 | Good | 2026-03-31T00:00:00+00:00

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Sandpoint, ID

US | 48 | Good | 2026-03-31T00:00:00+00:00

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Sangamon County, Illinois

US | 46 | Good | 2026-04-30T00:00:00+00:00

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Santa Barbara County, California

US | 3 | Good | 2026-04-01T00:00:00+00:00

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Santa Cruz County, Arizona

US | 39 | Good | 2026-03-31T00:00:00+00:00

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Santa Cruz County, California

US | 44 | Good | 2026-03-31T00:00:00+00:00

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Santa Cruz-Watsonville, CA

US | 44 | Good | 2026-03-31T00:00:00+00:00

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Santa Fe County, New Mexico

US | 47 | Good | 2026-03-31T00:00:00+00:00

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Santa Fe, NM

US | 47 | Good | 2026-03-31T00:00:00+00:00

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Santa Maria-Santa Barbara, CA

US | 3 | Good | 2026-04-01T00:00:00+00:00

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Santa Rosa County, Florida

US | 52 | Moderate | 2026-03-31T00:00:00+00:00

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Santa Rosa, CA

US | 8 | Good | 2026-03-31T00:00:00+00:00

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Sarasota County, Florida

US | 42 | Good | 2026-03-31T00:00:00+00:00

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Saratoga County, New York

US | 23 | Good | 2026-05-31T00:00:00+00:00

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Sarpy County, Nebraska

US | 26 | Good | 2026-03-31T00:00:00+00:00

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Sauk County, Wisconsin

US | 43 | Good | 2026-03-31T00:00:00+00:00

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Savannah, GA

US | 43 | Good | 2026-04-30T00:00:00+00:00

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Schoolcraft County, Michigan

US | 14 | Good | 2026-03-31T00:00:00+00:00

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Scioto County, Ohio

US | 241 | Very Unhealthy | 2026-04-30T00:00:00+00:00

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Scott County, Iowa

US | 3 | Good | 2026-06-01T00:00:00+00:00

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Scotts Bluff County, Nebraska

US | 11 | Good | 2026-03-31T00:00:00+00:00

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Scottsbluff, NE

US | 11 | Good | 2026-03-31T00:00:00+00:00

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Scranton--Wilkes-Barre--Hazleton, PA

US | 2 | Good | 2026-04-01T00:00:00+00:00

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Seattle-Tacoma-Bellevue, WA

US | 44 | Good | 2026-02-28T00:00:00+00:00

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Sebastian-Vero Beach, FL

US | 44 | Good | 2026-03-30T00:00:00+00:00

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Sebring, FL

US | 42 | Good | 2026-03-31T00:00:00+00:00

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Sedgwick County, Kansas

US | 57 | Moderate | 2026-03-31T00:00:00+00:00

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Seminole County, Florida

US | 32 | Good | 2026-03-31T00:00:00+00:00

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Sequoyah County, Oklahoma

US | 51 | Moderate | 2026-03-31T00:00:00+00:00

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Sevier County, Tennessee

US | 50 | Good | 2026-04-30T00:00:00+00:00

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Sevierville, TN

US | 50 | Good | 2026-04-30T00:00:00+00:00

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Shasta County, California

US | 37 | Good | 2026-04-30T00:00:00+00:00

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Shawnee County, Kansas

US | 55 | Moderate | 2026-03-31T00:00:00+00:00

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Sheboygan County, Wisconsin

US | 35 | Good | 2026-03-31T00:00:00+00:00

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Sheboygan, WI

US | 35 | Good | 2026-03-31T00:00:00+00:00

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Shelby County, Alabama

US | 32 | Good | 2026-03-31T00:00:00+00:00

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Shelby County, Indiana

US | 45 | Good | 2026-05-31T00:00:00+00:00

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Shelton, WA

US | 26 | Good | 2026-02-28T00:00:00+00:00

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Sheridan County, Wyoming

US | 7 | Good | 2026-03-31T00:00:00+00:00

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Sheridan, WY

US | 7 | Good | 2026-03-31T00:00:00+00:00

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Sherman County, Kansas

US | 41 | Good | 2026-03-31T00:00:00+00:00

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Shoshone County, Idaho

US | 38 | Good | 2026-03-31T00:00:00+00:00

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Show Low, AZ

US | 19 | Good | 2026-03-31T00:00:00+00:00

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Shreveport-Bossier City, LA

US | 42 | Good | 2026-05-31T00:00:00+00:00

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Sierra Vista-Douglas, AZ

US | 58 | Moderate | 2026-04-29T00:00:00+00:00

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Simpson County, Kentucky

US | 36 | Good | 2026-03-31T00:00:00+00:00

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Sioux City, IA-NE-SD

US | 46 | Good | 2026-05-31T00:00:00+00:00

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Sioux Falls, SD

US | 5 | Good | 2026-04-01T00:00:00+00:00

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Skagit County, Washington

US | 18 | Good | 2026-02-28T00:00:00+00:00

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Smith County, Texas

US | 43 | Good | 2026-03-31T00:00:00+00:00

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Snohomish County, Washington

US | 40 | Good | 2026-02-28T00:00:00+00:00

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Solano County, California

US | 9 | Good | 2026-03-27T00:00:00+00:00

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Somerset County, Pennsylvania

US | 42 | Good | 2026-03-31T00:00:00+00:00

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Somerset, KY

US | 46 | Good | 2026-03-31T00:00:00+00:00

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Somerset, PA

US | 42 | Good | 2026-03-31T00:00:00+00:00

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Sonoma County, California

US | 8 | Good | 2026-03-31T00:00:00+00:00

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SONORA County, Country Of Mexico

US | 52 | Moderate | 2026-03-31T00:00:00+00:00

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Sonora, CA

US | 32 | Good | 2026-01-31T00:00:00+00:00

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South Bend-Mishawaka, IN-MI

US | 21 | Good | 2026-05-31T00:00:00+00:00

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Spartanburg County, South Carolina

US | 41 | Good | 2026-05-31T00:00:00+00:00

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Spartanburg, SC

US | 41 | Good | 2026-05-31T00:00:00+00:00

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Spencer County, Indiana

US | 51 | Moderate | 2026-03-31T00:00:00+00:00

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Spokane County, Washington

US | 47 | Good | 2026-02-28T00:00:00+00:00

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Spokane-Spokane Valley, WA

US | 47 | Good | 2026-02-28T00:00:00+00:00

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Springfield, IL

US | 46 | Good | 2026-04-30T00:00:00+00:00

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Springfield, MA

US | 22 | Good | 2026-03-27T00:00:00+00:00

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Springfield, MO

US | 73 | Moderate | 2026-03-31T00:00:00+00:00

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Springfield, OH

US | 41 | Good | 2026-04-30T00:00:00+00:00

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St. Bernard County, Louisiana

US | 52 | Moderate | 2026-05-31T00:00:00+00:00

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St. Clair County, Michigan

US | 55 | Moderate | 2026-03-31T00:00:00+00:00

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St. George, UT

US | 64 | Moderate | 2026-05-31T00:00:00+00:00

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St. James County, Louisiana

US | 25 | Good | 2026-05-31T00:00:00+00:00

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St. John the Baptist County, Louisiana

US | 23 | Good | 2026-05-31T00:00:00+00:00

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St. Joseph County, Indiana

US | 21 | Good | 2026-05-31T00:00:00+00:00

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St. Joseph, MO-KS

US | 54 | Moderate | 2026-03-31T00:00:00+00:00

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St. Louis City County, Missouri

US | 5 | Good | 2026-04-01T00:00:00+00:00

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St. Louis, MO-IL

US | 49 | Good | 2026-04-30T00:00:00+00:00

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St. Lucie County, Florida

US | 41 | Good | 2026-03-31T00:00:00+00:00

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St. Martin County, Louisiana

US | 23 | Good | 2026-05-31T00:00:00+00:00

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St. Marys, PA

US | 44 | Good | 2026-03-31T00:00:00+00:00

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St. Tammany County, Louisiana

US | 42 | Good | 2026-05-31T00:00:00+00:00

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Stafford County, Virginia

US | 44 | Good | 2026-04-30T00:00:00+00:00

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Stanislaus County, California

US | 31 | Good | 2026-04-26T00:00:00+00:00

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Stark County, Ohio

US | 51 | Moderate | 2026-05-31T00:00:00+00:00

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State College, PA

US | 43 | Good | 2026-03-31T00:00:00+00:00

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Steamboat Springs, CO

US | 17 | Good | 2026-04-30T00:00:00+00:00

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Steuben County, New York

US | 1 | Good | 2026-06-01T00:00:00+00:00

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Stevens County, Washington

US | 38 | Good | 2026-02-28T00:00:00+00:00

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Stockton-Lodi, CA

US | 48 | Good | 2026-03-31T00:00:00+00:00

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Sublette County, Wyoming

US | 43 | Good | 2026-03-31T00:00:00+00:00

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Suffolk City County, Virginia

US | 37 | Good | 2026-04-30T00:00:00+00:00

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Suffolk County, Massachusetts

US | 37 | Good | 2026-03-30T00:00:00+00:00

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Suffolk County, New York

US | 2 | Good | 2026-06-01T00:00:00+00:00

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Sullivan County, Tennessee

US | 42 | Good | 2026-03-31T00:00:00+00:00

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Summit County, Ohio

US | 51 | Moderate | 2026-05-31T00:00:00+00:00

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Sumner County, Kansas

US | 58 | Moderate | 2026-03-31T00:00:00+00:00

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Sumner County, Tennessee

US | 52 | Moderate | 2026-03-31T00:00:00+00:00

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Sumter County, Alabama

US | 33 | Good | 2026-03-31T00:00:00+00:00

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Sutter County, California

US | 70 | Moderate | 2026-01-31T00:00:00+00:00

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Swain County, North Carolina

US | 45 | Good | 2026-04-30T00:00:00+00:00

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Sweetwater County, Wyoming

US | 39 | Good | 2026-03-31T00:00:00+00:00

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Syracuse, NY

US | 40 | Good | 2026-05-31T00:00:00+00:00

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Tallahassee, FL

US | 1 | Good | 2026-04-01T00:00:00+00:00

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Tampa-St. Petersburg-Clearwater, FL

US | 3 | Good | 2026-04-01T00:00:00+00:00

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Taos County, New Mexico

US | 28 | Good | 2026-03-31T00:00:00+00:00

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Taos, NM

US | 28 | Good | 2026-03-31T00:00:00+00:00

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Tarrant County, Texas

US | 5 | Good | 2026-04-01T00:00:00+00:00

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Taylor County, Wisconsin

US | 41 | Good | 2026-03-31T00:00:00+00:00

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Terre Haute, IN

US | 45 | Good | 2026-05-31T00:00:00+00:00

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Teton County, Wyoming

US | 58 | Moderate | 2026-04-30T00:00:00+00:00

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Texarkana, TX-AR

US | 54 | Moderate | 2026-03-31T00:00:00+00:00

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Thurston County, Washington

US | 24 | Good | 2026-01-31T00:00:00+00:00

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Tippecanoe County, Indiana

US | 34 | Good | 2026-04-30T00:00:00+00:00

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Toledo, OH

US | 20 | Good | 2026-05-01T00:00:00+00:00

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Tompkins County, New York

US | 38 | Good | 2026-03-31T00:00:00+00:00

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Tooele County, Utah

US | 25 | Good | 2026-05-31T00:00:00+00:00

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Topeka, KS

US | 55 | Moderate | 2026-03-31T00:00:00+00:00

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Travis County, Texas

US | 3 | Good | 2026-04-01T00:00:00+00:00

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Trego County, Kansas

US | 48 | Good | 2026-03-31T00:00:00+00:00

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Trenton, NJ

US | 52 | Moderate | 2026-03-31T00:00:00+00:00

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Trinity County, California

US | 32 | Good | 2026-03-31T00:00:00+00:00

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Truckee-Grass Valley, CA

US | 7 | Good | 2026-03-31T00:00:00+00:00

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Trumbull County, Ohio

US | 38 | Good | 2026-04-30T00:00:00+00:00

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Tucker County, West Virginia

US | 43 | Good | 2026-03-31T00:00:00+00:00

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Tucson, AZ

US | 2 | Good | 2026-04-01T00:00:00+00:00

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Tulare County, California

US | 64 | Moderate | 2026-04-30T00:00:00+00:00

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Tulsa County, Oklahoma

US | 2 | Good | 2026-05-01T00:00:00+00:00

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Tulsa, OK

US | 2 | Good | 2026-05-01T00:00:00+00:00

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Tuolumne County, California

US | 32 | Good | 2026-01-31T00:00:00+00:00

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Tupelo, MS

US | 32 | Good | 2026-05-31T00:00:00+00:00

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Tuscaloosa County, Alabama

US | 40 | Good | 2026-03-31T00:00:00+00:00

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Tuscaloosa, AL

US | 40 | Good | 2026-03-31T00:00:00+00:00

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Tuscola County, Michigan

US | 38 | Good | 2026-03-25T00:00:00+00:00

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Twin Falls County, Idaho

US | 33 | Good | 2026-03-31T00:00:00+00:00

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Twin Falls, ID

US | 33 | Good | 2026-03-31T00:00:00+00:00

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Tyler, TX

US | 43 | Good | 2026-03-31T00:00:00+00:00

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Uinta County, Wyoming

US | 9 | Good | 2026-03-31T00:00:00+00:00

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Uintah County, Utah

US | 48 | Good | 2026-05-31T00:00:00+00:00

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Umatilla County, Oregon

US | 18 | Good | 2026-04-30T00:00:00+00:00

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Union County, Arkansas

US | 54 | Moderate | 2026-03-30T00:00:00+00:00

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Union County, New Jersey

US | 3 | Good | 2026-04-01T00:00:00+00:00

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Union County, North Carolina

US | 47 | Good | 2026-04-30T00:00:00+00:00

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Union County, Oregon

US | 14 | Good | 2026-03-27T00:00:00+00:00

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Urban Honolulu, HI

US | 5 | Good | 2026-04-01T00:00:00+00:00

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Utah County, Utah

US | 2 | Good | 2026-06-01T00:00:00+00:00

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Utica-Rome, NY

US | 17 | Good | 2026-05-31T00:00:00+00:00

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Valdosta, GA

US | 37 | Good | 2026-04-30T00:00:00+00:00

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Valencia County, New Mexico

US | 44 | Good | 2026-03-31T00:00:00+00:00

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Vallejo-Fairfield, CA

US | 9 | Good | 2026-03-27T00:00:00+00:00

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Valley County, Idaho

US | 23 | Good | 2026-03-31T00:00:00+00:00

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Van Buren County, Iowa

US | 52 | Moderate | 2026-05-31T00:00:00+00:00

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Vanderburgh County, Indiana

US | 50 | Good | 2026-05-31T00:00:00+00:00

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Ventura County, California

US | 43 | Good | 2026-01-31T00:00:00+00:00

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Vermillion, SD

US | 34 | Good | 2026-03-31T00:00:00+00:00

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Vernal, UT

US | 48 | Good | 2026-05-31T00:00:00+00:00

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Victoria County, Texas

US | 29 | Good | 2026-03-31T00:00:00+00:00

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Victoria, TX

US | 29 | Good | 2026-03-31T00:00:00+00:00

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Vigo County, Indiana

US | 45 | Good | 2026-05-31T00:00:00+00:00

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Vilas County, Wisconsin

US | 37 | Good | 2026-03-31T00:00:00+00:00

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Vincennes, IN

US | 44 | Good | 2026-03-31T00:00:00+00:00

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Vineland-Bridgeton, NJ

US | 44 | Good | 2026-03-31T00:00:00+00:00

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Vineyard Haven, MA

US | 43 | Good | 2026-02-28T00:00:00+00:00

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Virginia Beach City County, Virginia

US | 23 | Good | 2026-05-31T00:00:00+00:00

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Virginia Beach-Norfolk-Newport News, VA-NC

US | 23 | Good | 2026-05-31T00:00:00+00:00

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Visalia-Porterville, CA

US | 64 | Moderate | 2026-04-30T00:00:00+00:00

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Volusia County, Florida

US | 42 | Good | 2026-03-31T00:00:00+00:00

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Wabash County, Indiana

US | 39 | Good | 2026-03-31T00:00:00+00:00

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Wabash, IN

US | 39 | Good | 2026-03-31T00:00:00+00:00

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Waco, TX

US | 3 | Good | 2026-04-01T00:00:00+00:00

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Wake County, North Carolina

US | 39 | Good | 2026-04-30T00:00:00+00:00

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Wakulla County, Florida

US | 1 | Good | 2026-04-01T00:00:00+00:00

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Walker County, Georgia

US | 21 | Good | 2026-04-30T00:00:00+00:00

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Walla Walla County, Washington

US | 33 | Good | 2026-02-28T00:00:00+00:00

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Walla Walla, WA

US | 29 | Good | 2026-03-31T00:00:00+00:00

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Walworth County, Wisconsin

US | 28 | Good | 2026-03-31T00:00:00+00:00

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Ward County, North Dakota

US | 40 | Good | 2026-03-31T00:00:00+00:00

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Warner Robins, GA

US | 41 | Good | 2026-04-30T00:00:00+00:00

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Warren County, Kentucky

US | 48 | Good | 2026-03-31T00:00:00+00:00

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Warren County, New Jersey

US | 46 | Good | 2026-03-31T00:00:00+00:00

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Warren County, Ohio

US | 42 | Good | 2026-04-30T00:00:00+00:00

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Warrick County, Indiana

US | 44 | Good | 2026-05-31T00:00:00+00:00

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Wasatch County, Utah

US | 54 | Moderate | 2026-05-31T00:00:00+00:00

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Washakie County, Wyoming

US | 13 | Good | 2026-04-30T00:00:00+00:00

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Washington County, Arkansas

US | 42 | Good | 2026-03-31T00:00:00+00:00

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Washington County, Georgia

US | 47 | Good | 2026-04-30T00:00:00+00:00

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Washington County, Kentucky

US | 44 | Good | 2026-03-31T00:00:00+00:00

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Washington County, Maine

US | 33 | Good | 2026-05-31T00:00:00+00:00

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Washington County, Maryland

US | 38 | Good | 2026-03-31T00:00:00+00:00

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Washington County, Nebraska

US | 15 | Good | 2026-03-31T00:00:00+00:00

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Washington County, Ohio

US | 33 | Good | 2026-04-30T00:00:00+00:00

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Washington County, Oregon

US | 2 | Good | 2026-04-01T00:00:00+00:00

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Washington County, Rhode Island

US | 56 | Moderate | 2026-03-31T00:00:00+00:00

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Washington County, Utah

US | 64 | Moderate | 2026-05-31T00:00:00+00:00

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Washington-Arlington-Alexandria, DC-VA-MD-WV

US | 5 | Good | 2026-06-01T00:00:00+00:00

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Washoe County, Nevada

US | 0 | Good | 2026-04-01T00:00:00+00:00

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Washtenaw County, Michigan

US | 53 | Moderate | 2026-03-31T00:00:00+00:00

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Waterloo-Cedar Falls, IA

US | 39 | Good | 2026-05-31T00:00:00+00:00

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Watertown, SD

US | 42 | Good | 2026-03-31T00:00:00+00:00

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Watertown-Fort Atkinson, WI

US | 28 | Good | 2026-03-31T00:00:00+00:00

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Watertown-Fort Drum, NY

US | 33 | Good | 2026-05-31T00:00:00+00:00

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Waukesha County, Wisconsin

US | 48 | Good | 2026-03-31T00:00:00+00:00

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Wausau, WI

US | 40 | Good | 2026-03-31T00:00:00+00:00

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Wayne County, Michigan

US | 8 | Good | 2026-04-01T00:00:00+00:00

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Wayne County, New York

US | 41 | Good | 2026-05-31T00:00:00+00:00

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Webb County, Texas

US | 0 | Good | 2026-04-01T00:00:00+00:00

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Weber County, Utah

US | 2 | Good | 2026-06-01T00:00:00+00:00

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Webster County, Iowa

US | 36 | Good | 2026-05-31T00:00:00+00:00

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Weirton-Steubenville, WV-OH

US | 34 | Good | 2026-04-30T00:00:00+00:00

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Weld County, Colorado

US | 28 | Good | 2026-04-30T00:00:00+00:00

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Wenatchee, WA

US | 28 | Good | 2026-02-28T00:00:00+00:00

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West Baton Rouge County, Louisiana

US | 42 | Good | 2026-05-31T00:00:00+00:00

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Westchester County, New York

US | 35 | Good | 2026-05-31T00:00:00+00:00

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Wexford County, Michigan

US | 34 | Good | 2026-03-31T00:00:00+00:00

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Whatcom County, Washington

US | 26 | Good | 2026-02-28T00:00:00+00:00

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Wheeling, WV-OH

US | 36 | Good | 2026-03-31T00:00:00+00:00

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White Pine County, Nevada

US | 45 | Good | 2026-04-30T00:00:00+00:00

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Whitewater-Elkhorn, WI

US | 28 | Good | 2026-03-31T00:00:00+00:00

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Whitley County, Indiana

US | 55 | Moderate | 2026-03-31T00:00:00+00:00

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Whitman County, Washington

US | 17 | Good | 2026-02-28T00:00:00+00:00

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Wichita, KS

US | 58 | Moderate | 2026-03-31T00:00:00+00:00

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Will County, Illinois

US | 40 | Good | 2026-04-30T00:00:00+00:00

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Williamson County, Tennessee

US | 35 | Good | 2026-03-31T00:00:00+00:00

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Wilmington, NC

US | 37 | Good | 2026-04-30T00:00:00+00:00

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Wilmington, OH

US | 37 | Good | 2026-04-30T00:00:00+00:00

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Wilson County, Tennessee

US | 38 | Good | 2026-03-31T00:00:00+00:00

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Wilson County, Texas

US | 5 | Good | 2026-03-31T00:00:00+00:00

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Winchester, VA-WV

US | 23 | Good | 2026-05-31T00:00:00+00:00

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Windham County, Connecticut

US | 47 | Good | 2026-03-31T00:00:00+00:00

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Winnebago County, Illinois

US | 38 | Good | 2026-04-30T00:00:00+00:00

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Winston-Salem, NC

US | 22 | Good | 2026-04-30T00:00:00+00:00

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Wood County, Ohio

US | 39 | Good | 2026-04-30T00:00:00+00:00

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Wood County, West Virginia

US | 54 | Moderate | 2026-03-30T00:00:00+00:00

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Woodbury County, Iowa

US | 46 | Good | 2026-05-31T00:00:00+00:00

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Worcester County, Massachusetts

US | 5 | Good | 2026-03-01T00:00:00+00:00

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Worcester, MA-CT

US | 47 | Good | 2026-03-31T00:00:00+00:00

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Wyandotte County, Kansas

US | 54 | Moderate | 2026-03-31T00:00:00+00:00

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Wythe County, Virginia

US | 42 | Good | 2026-04-30T00:00:00+00:00

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Yakima County, Washington

US | 52 | Moderate | 2026-02-28T00:00:00+00:00

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Yakima, WA

US | 52 | Moderate | 2026-02-28T00:00:00+00:00

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Yalobusha County, Mississippi

US | 35 | Good | 2026-03-31T00:00:00+00:00

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Yancey County, North Carolina

US | 44 | Good | 2026-04-30T00:00:00+00:00

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Yavapai County, Arizona

US | 43 | Good | 2026-03-31T00:00:00+00:00

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Yolo County, California

US | 18 | Good | 2026-03-27T00:00:00+00:00

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York County, Maine

US | 26 | Good | 2026-05-31T00:00:00+00:00

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York County, South Carolina

US | 44 | Good | 2026-04-30T00:00:00+00:00

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Youngstown-Warren-Boardman, OH-PA

US | 38 | Good | 2026-04-30T00:00:00+00:00

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Yuba City, CA

US | 70 | Moderate | 2026-01-31T00:00:00+00:00

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Yuma County, Arizona

US | 80 | Moderate | 2026-05-31T00:00:00+00:00

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Yuma, AZ

US | 80 | Moderate | 2026-05-31T00:00:00+00:00

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