Air quality reference
Vermillion, SD
Vermillion, SD has a published AQI value of 34, categorized as Good, for 2026-03-31T00:00:00+00:00. The defining parameter is Ozone, based on 1 monitoring sites. AQI is a communication index rather than a direct pollutant concentration, and values from different dates, averaging periods or providers should not be treated as interchangeable. This profile provides measurement context and same-category links but does not provide individualized medical advice.
Key facts
- Location
- Vermillion, SD
- Air quality index
- 34
- Category
- Good
- Defining parameter
- Ozone
- Sites reporting
- 1
- Measured at
- 2026-03-31T00:00:00+00:00
- Measurement context
- Daily AQI summary from U.S. EPA AirData; values are not direct pollutant concentrations
Historical air-quality context
Published EPA annual CBSA indicators
Annual AQI summaries are shown independently from pollutant concentrations. Current-year values are provisional because reporting is incomplete and can be revised.
Annual indicator
Days with published AQI
90.00 days2026
EPA annual CBSA summary field: Days with AQI. Current-year values are provisional because reporting is incomplete and can be revised. Values retain the source period and unit.
View source data
| Period | days | Source flag | Confidentiality |
|---|---|---|---|
| 2026 | 90.00 days | provisional-current-year | — |
| 2025 | 351.00 days | — | — |
| 2024 | 366.00 days | — | — |
| 2023 | 365.00 days | — | — |
| 2022 | 365.00 days | — | — |
Annual indicator
Good AQI days
85.00 days2026
EPA annual CBSA summary field: Good Days. Current-year values are provisional because reporting is incomplete and can be revised. Values retain the source period and unit.
View source data
| Period | days | Source flag | Confidentiality |
|---|---|---|---|
| 2026 | 85.00 days | provisional-current-year | — |
| 2025 | 308.00 days | — | — |
| 2024 | 289.00 days | — | — |
| 2023 | 244.00 days | — | — |
| 2022 | 320.00 days | — | — |
Annual indicator
Hazardous AQI days
0.00 days2026
EPA annual CBSA summary field: Hazardous Days. Current-year values are provisional because reporting is incomplete and can be revised. Values retain the source period and unit.
View source data
| Period | days | Source flag | Confidentiality |
|---|---|---|---|
| 2026 | 0.00 days | provisional-current-year | — |
| 2025 | 0.00 days | — | — |
| 2024 | 0.00 days | — | — |
| 2023 | 0.00 days | — | — |
| 2022 | 0.00 days | — | — |
Annual indicator
Maximum daily AQI
58.00 AQI index2026
EPA annual CBSA summary field: Max AQI. Current-year values are provisional because reporting is incomplete and can be revised. Values retain the source period and unit.
View source data
| Period | AQI index | Source flag | Confidentiality |
|---|---|---|---|
| 2026 | 58.00 AQI index | provisional-current-year | — |
| 2025 | 117.00 AQI index | — | — |
| 2024 | 137.00 AQI index | — | — |
| 2023 | 173.00 AQI index | — | — |
| 2022 | 87.00 AQI index | — | — |
Annual indicator
Median daily AQI
31.00 AQI index2026
EPA annual CBSA summary field: Median AQI. Current-year values are provisional because reporting is incomplete and can be revised. Values retain the source period and unit.
View source data
| Period | AQI index | Source flag | Confidentiality |
|---|---|---|---|
| 2026 | 31.00 AQI index | provisional-current-year | — |
| 2025 | 34.00 AQI index | — | — |
| 2024 | 39.00 AQI index | — | — |
| 2023 | 43.00 AQI index | — | — |
| 2022 | 38.00 AQI index | — | — |
Annual indicator
Moderate AQI days
5.00 days2026
EPA annual CBSA summary field: Moderate Days. Current-year values are provisional because reporting is incomplete and can be revised. Values retain the source period and unit.
View source data
| Period | days | Source flag | Confidentiality |
|---|---|---|---|
| 2026 | 5.00 days | provisional-current-year | — |
| 2025 | 41.00 days | — | — |
| 2024 | 75.00 days | — | — |
| 2023 | 103.00 days | — | — |
| 2022 | 45.00 days | — | — |
Annual indicator
90th percentile daily AQI
41.00 AQI index2026
EPA annual CBSA summary field: 90th Percentile AQI. Current-year values are provisional because reporting is incomplete and can be revised. Values retain the source period and unit.
View source data
| Period | AQI index | Source flag | Confidentiality |
|---|---|---|---|
| 2026 | 41.00 AQI index | provisional-current-year | — |
| 2025 | 53.00 AQI index | — | — |
| 2024 | 57.00 AQI index | — | — |
| 2023 | 80.00 AQI index | — | — |
| 2022 | 53.00 AQI index | — | — |
Annual indicator
Unhealthy AQI days
0.00 days2026
EPA annual CBSA summary field: Unhealthy Days. Current-year values are provisional because reporting is incomplete and can be revised. Values retain the source period and unit.
View source data
| Period | days | Source flag | Confidentiality |
|---|---|---|---|
| 2026 | 0.00 days | provisional-current-year | — |
| 2025 | 0.00 days | — | — |
| 2024 | 0.00 days | — | — |
| 2023 | 3.00 days | — | — |
| 2022 | 0.00 days | — | — |
Annual indicator
Unhealthy for sensitive groups days
0.00 days2026
EPA annual CBSA summary field: Unhealthy for Sensitive Groups Days. Current-year values are provisional because reporting is incomplete and can be revised. Values retain the source period and unit.
View source data
| Period | days | Source flag | Confidentiality |
|---|---|---|---|
| 2026 | 0.00 days | provisional-current-year | — |
| 2025 | 2.00 days | — | — |
| 2024 | 2.00 days | — | — |
| 2023 | 15.00 days | — | — |
| 2022 | 0.00 days | — | — |
Annual indicator
Very unhealthy AQI days
0.00 days2026
EPA annual CBSA summary field: Very Unhealthy Days. Current-year values are provisional because reporting is incomplete and can be revised. Values retain the source period and unit.
View source data
| Period | days | Source flag | Confidentiality |
|---|---|---|---|
| 2026 | 0.00 days | provisional-current-year | — |
| 2025 | 0.00 days | — | — |
| 2024 | 0.00 days | — | — |
| 2023 | 0.00 days | — | — |
| 2022 | 0.00 days | — | — |
Field-level provenance
Sources for this profile
Dates and licenses apply to the specific facts and series supplied by each source.
U.S. EPA AirData
- Applicable date
- 2026-03-31
- Dataset version
- 10350f77cf0f
- License
- U.S. federal factual data; verify third-party fields
- Attribution
- U.S. Environmental Protection Agency
U.S. EPA AirData
- Applicable date
- 2026-07-30
- Dataset version
- annual-aqi-by-cbsa-v1
- License
- U.S. federal factual data; verify third-party fields
- Attribution
- U.S. Environmental Protection Agency
DataOfWorld deterministic air-quality profile template
- Applicable date
- 2026-03-31
- Dataset version
- air-quality-profile-v1
- License
- Original DataOfWorld text
- Attribution
- DataOfWorld
Reference data can change. Verify consequential decisions against the original source.