EnviroNearby

Andrew County, Missouri air quality history

Daily Air Quality Index summaries from EPA monitors in Andrew, Missouri, 2009–2025.

87%
Good days in 2025
40
Median daily AQI, 2025
0
Days above 100 in 2025
245
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Andrew, Missouri on 245 days. 213 of those days (87%) were in the Good range, and the median daily AQI was 40. That median is about the same as the typical monitored county in Missouri (median 41 across 19 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 245 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 80% in 2009–2011 versus 82% in 2023–2025.

EPA did not report an AQI for every day of 2025 here (245 of 365 days). Figures describe monitored days only; seasonal monitoring (for example, ozone measured only in warmer months) can make a county look cleaner or dirtier than a full-year record would.

How the days broke down each year

Each bar is one year. The colored segments show the share of monitored days that fell in each AQI category.

Share of monitored days in each AQI category, by year0%25%50%75%100%2009: Good 173 of 205 days2009: Moderate 32 of 205 days20092010: Good 166 of 210 days2010: Moderate 38 of 210 days2010: Unhealthy for Sensitive Groups 6 of 210 days2011: Good 186 of 239 days2011: Moderate 45 of 239 days2011: Unhealthy for Sensitive Groups 8 of 239 days20112012: Good 135 of 214 days2012: Moderate 62 of 214 days2012: Unhealthy for Sensitive Groups 16 of 214 days2012: Unhealthy 1 of 214 days2013: Good 176 of 214 days2013: Moderate 35 of 214 days2013: Unhealthy for Sensitive Groups 3 of 214 days20132014: Good 182 of 212 days2014: Moderate 30 of 212 days2015: Good 184 of 213 days2015: Moderate 29 of 213 days20152016: Good 188 of 214 days2016: Moderate 26 of 214 days2017: Good 203 of 243 days2017: Moderate 39 of 243 days2017: Unhealthy for Sensitive Groups 1 of 243 days20172018: Good 186 of 245 days2018: Moderate 58 of 245 days2018: Unhealthy for Sensitive Groups 1 of 245 days2019: Good 227 of 245 days2019: Moderate 18 of 245 days20192020: Good 225 of 245 days2020: Moderate 20 of 245 days2021: Good 225 of 245 days2021: Moderate 20 of 245 days20212022: Good 213 of 245 days2022: Moderate 31 of 245 days2022: Unhealthy for Sensitive Groups 1 of 245 days2023: Good 176 of 244 days2023: Moderate 62 of 244 days2023: Unhealthy for Sensitive Groups 6 of 244 days20232024: Good 227 of 264 days2024: Moderate 37 of 264 days2025: Good 213 of 245 days2025: Moderate 32 of 245 days2025
  • Good
  • Moderate
  • Unhealthy for Sensitive Groups
  • Unhealthy
  • Very Unhealthy
  • Hazardous

Typical and high-end AQI over time

The median is the middle day of the year. The 90th percentile is the level that only the highest 10% of days exceeded.

Median and 90th-percentile daily AQI, by year0501002009: 90th percentile AQI 582010: 90th percentile AQI 772011: 90th percentile AQI 712012: 90th percentile AQI 972013: 90th percentile AQI 672014: 90th percentile AQI 542015: 90th percentile AQI 542016: 90th percentile AQI 582017: 90th percentile AQI 582018: 90th percentile AQI 742019: 90th percentile AQI 492020: 90th percentile AQI 492021: 90th percentile AQI 502022: 90th percentile AQI 512023: 90th percentile AQI 772024: 90th percentile AQI 582025: 90th percentile AQI 582009: Median AQI 392010: Median AQI 412011: Median AQI 422012: Median AQI 462013: Median AQI 422014: Median AQI 392015: Median AQI 402016: Median AQI 402017: Median AQI 422018: Median AQI 422019: Median AQI 402020: Median AQI 382021: Median AQI 392022: Median AQI 432023: Median AQI 432024: Median AQI 422025: Median AQI 40200920112013201520172019202120232025
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2025

On each monitored day, the AQI reflects whichever measured pollutant had the highest index. This counts how many days each pollutant set the AQI. A pollutant that was not measured here cannot appear.

PollutantDays as main pollutantShare of monitored days
Ozone245100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025245213320000405893Ozone
20242642273700004258100Ozone
20232441766260004377122Ozone
20222452133110004351101Ozone
2021245225200000395090Ozone
2020245225200000384977Ozone
2019245227180000404980Ozone
20182451865810004274112Ozone
20172432033910004258101Ozone
20162141882600004058100Ozone
2015213184290000405487Ozone
20142121823000003954100Ozone
20132141763530004267115Ozone
201221413562161004697151Ozone
20112391864580004271147Ozone
20102101663860004177136Ozone
20092051733200003958100Ozone

What this data can and can’t tell you

It is a county-level summary. EPA reports one AQI per day for the county, based on the monitors operating there. Air at a particular street, school or home can differ, especially near roads, industry or wildfire smoke.

It is not a health assessment. The AQI is EPA’s scale for communicating daily air quality. A county’s history can’t tell you what the health risk is for any particular person. For daily conditions and health guidance, see AirNow.

Rules change over time. EPA has revised AQI breakpoints, most recently for fine particles in 2024, so some year-to-year change can reflect the scale rather than the air.

Counties in Missouri with a similar median AQI in 2025

All monitored counties in Missouri

Source: U.S. EPA AirData, “Annual AQI by County” files for 2009–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem