# Highest daily Air Quality Index (US EPA) in Scott County

Highest daily Air Quality Index (US EPA) in Scott County was 159 in 2025. Source: U.S. Environmental Protection Agency.

- Indicator id: `aqi_max`
- Place id: `us-county-19163`
- Unit: index
- Definition: Highest daily Air Quality Index (AQI) value recorded in a US county during the year, from the EPA AirData annual summaries. Values above 500 are beyond the AQI scale and are published as EPA computes them.
- Note: A single day decides the value, so one wildfire or dust event can set it. Dust from the dry Owens Lake bed puts Inyo and Mono counties in California in the thousands. United States counties with air quality monitors only, about 1,000 of some 3,100 in recent years; a county without monitors has no value. The number of days with an AQI differs between counties because some monitors run only in the ozone season.
- Source: U.S. Environmental Protection Agency, EPA AirData annual AQI by county: highest daily AQI (https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual)
- Publisher page: https://invokely.ai/en/publishers/environmental-protection-agency
- Retrieved: 2026-10-12
- License: Public domain (US government work, 17 U.S.C. 105); citation requested
- Citation: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
- Web page: https://invokely.ai/en/highest-daily-air-quality-index/scott-county-iowa
- API: https://invokely.ai/api/v1/series?indicator=aqi_max&place=us-county-19163

| Period | index |
|---|---:|
| 2025 | 159 |
| 2024 | 90 |
| 2023 | 219 |
| 2022 | 96 |
| 2021 | 102 |
| 2020 | 156 |
| 2019 | 112 |
| 2018 | 108 |
| 2017 | 103 |
| 2016 | 112 |
| 2015 | 153 |
| 2014 | 111 |
| 2013 | 126 |
| 2012 | 134 |
| 2011 | 105 |
| 2010 | 117 |
| 2009 | 112 |
| 2008 | 156 |
| 2007 | 152 |
| 2006 | 111 |
| 2005 | 140 |
| 2004 | 136 |
| 2003 | 140 |
| 2002 | 192 |
| 2001 | 147 |
| 2000 | 151 |
| 1999 | 164 |
| 1998 | 156 |
| 1997 | 140 |
| 1996 | 159 |
| 1995 | 156 |
| 1994 | 154 |
| 1993 | 143 |
| 1992 | 182 |
| 1991 | 156 |
| 1990 | 164 |
| 1989 | 200 |
| 1988 | 202 |
| 1987 | 179 |
| 1986 | 133 |
| 1985 | 129 |
| 1984 | 140 |
| 1983 | 172 |
| 1982 | 115 |
| 1981 | 97 |
| 1980 | 240 |