EnviroNearby

Madison County, Alabama air quality history

Daily Air Quality Index summaries from EPA monitors in Madison, Alabama, 1980–2025.

72%
Good days in 2025
42
Median daily AQI, 2025
0
Days above 100 in 2025
365
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Madison, Alabama on 365 days. 263 of those days (72%) were in the Good range, and the median daily AQI was 42. That median is about the same as the typical monitored county in Alabama (median 41 across 14 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 239 days. Across the years with fuller monitoring, the share of Good days rose: an average of 63% in 1980–1982 versus 66% in 2023–2025.

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%1980: Good 154 of 344 days1980: Moderate 125 of 344 days1980: Unhealthy for Sensitive Groups 60 of 344 days1980: Unhealthy 5 of 344 days19801981: Good 251 of 352 days1981: Moderate 80 of 352 days1981: Unhealthy for Sensitive Groups 21 of 352 days1982: Good 231 of 315 days1982: Moderate 64 of 315 days1982: Unhealthy for Sensitive Groups 17 of 315 days1982: Unhealthy 3 of 315 days1983: Good 119 of 165 days1983: Moderate 31 of 165 days1983: Unhealthy for Sensitive Groups 11 of 165 days1983: Unhealthy 3 of 165 days1983: Very Unhealthy 1 of 165 days1987: Good 149 of 237 days1987: Moderate 60 of 237 days1987: Unhealthy for Sensitive Groups 22 of 237 days1987: Unhealthy 6 of 237 days1988: Good 243 of 366 days1988: Moderate 67 of 366 days1988: Unhealthy for Sensitive Groups 34 of 366 days1988: Unhealthy 20 of 366 days1988: Very Unhealthy 2 of 366 days19881989: Good 276 of 365 days1989: Moderate 83 of 365 days1989: Unhealthy for Sensitive Groups 6 of 365 days1990: Good 282 of 362 days1990: Moderate 67 of 362 days1990: Unhealthy for Sensitive Groups 13 of 362 days1991: Good 245 of 365 days1991: Moderate 91 of 365 days1991: Unhealthy for Sensitive Groups 27 of 365 days1991: Unhealthy 2 of 365 days1992: Good 275 of 366 days1992: Moderate 72 of 366 days1992: Unhealthy for Sensitive Groups 15 of 366 days1992: Unhealthy 4 of 366 days1993: Good 244 of 365 days1993: Moderate 84 of 365 days1993: Unhealthy for Sensitive Groups 32 of 365 days1993: Unhealthy 4 of 365 days1993: Very Unhealthy 1 of 365 days19931994: Good 272 of 365 days1994: Moderate 77 of 365 days1994: Unhealthy for Sensitive Groups 14 of 365 days1994: Unhealthy 2 of 365 days1995: Good 239 of 365 days1995: Moderate 89 of 365 days1995: Unhealthy for Sensitive Groups 34 of 365 days1995: Unhealthy 3 of 365 days1996: Good 226 of 366 days1996: Moderate 107 of 366 days1996: Unhealthy for Sensitive Groups 29 of 366 days1996: Unhealthy 4 of 366 days1997: Good 277 of 365 days1997: Moderate 69 of 365 days1997: Unhealthy for Sensitive Groups 15 of 365 days1997: Unhealthy 4 of 365 days1998: Good 257 of 365 days1998: Moderate 64 of 365 days1998: Unhealthy for Sensitive Groups 34 of 365 days1998: Unhealthy 10 of 365 days19981999: Good 180 of 364 days1999: Moderate 136 of 364 days1999: Unhealthy for Sensitive Groups 33 of 364 days1999: Unhealthy 15 of 364 days2000: Good 179 of 366 days2000: Moderate 151 of 366 days2000: Unhealthy for Sensitive Groups 30 of 366 days2000: Unhealthy 6 of 366 days2001: Good 212 of 364 days2001: Moderate 136 of 364 days2001: Unhealthy for Sensitive Groups 16 of 364 days2002: Good 227 of 365 days2002: Moderate 112 of 365 days2002: Unhealthy for Sensitive Groups 24 of 365 days2002: Unhealthy 2 of 365 days2003: Good 208 of 365 days2003: Moderate 143 of 365 days2003: Unhealthy for Sensitive Groups 14 of 365 days20032004: Good 222 of 365 days2004: Moderate 131 of 365 days2004: Unhealthy for Sensitive Groups 12 of 365 days2005: Good 209 of 364 days2005: Moderate 134 of 364 days2005: Unhealthy for Sensitive Groups 21 of 364 days2006: Good 206 of 362 days2006: Moderate 142 of 362 days2006: Unhealthy for Sensitive Groups 12 of 362 days2006: Unhealthy 2 of 362 days2007: Good 185 of 364 days2007: Moderate 154 of 364 days2007: Unhealthy for Sensitive Groups 23 of 364 days2007: Unhealthy 2 of 364 days2008: Good 116 of 366 days2008: Moderate 241 of 366 days2008: Unhealthy for Sensitive Groups 9 of 366 days20082009: Good 252 of 349 days2009: Moderate 96 of 349 days2009: Unhealthy for Sensitive Groups 1 of 349 days2010: Good 205 of 335 days2010: Moderate 126 of 335 days2010: Unhealthy for Sensitive Groups 4 of 335 days2011: Good 194 of 331 days2011: Moderate 133 of 331 days2011: Unhealthy for Sensitive Groups 4 of 331 days2012: Good 213 of 338 days2012: Moderate 111 of 338 days2012: Unhealthy for Sensitive Groups 14 of 338 days2013: Good 255 of 336 days2013: Moderate 81 of 336 days20132014: Good 264 of 338 days2014: Moderate 74 of 338 days2015: Good 265 of 333 days2015: Moderate 68 of 333 days2016: Good 258 of 333 days2016: Moderate 74 of 333 days2016: Unhealthy for Sensitive Groups 1 of 333 days2017: Good 277 of 335 days2017: Moderate 58 of 335 days2018: Good 194 of 365 days2018: Moderate 170 of 365 days2018: Unhealthy for Sensitive Groups 1 of 365 days20182019: Good 189 of 361 days2019: Moderate 172 of 361 days2020: Good 210 of 364 days2020: Moderate 154 of 364 days2021: Good 189 of 357 days2021: Moderate 166 of 357 days2021: Unhealthy for Sensitive Groups 2 of 357 days2022: Good 201 of 365 days2022: Moderate 164 of 365 days2023: Good 204 of 364 days2023: Moderate 157 of 364 days2023: Unhealthy for Sensitive Groups 3 of 364 days20232024: Good 254 of 363 days2024: Moderate 109 of 363 days2025: Good 263 of 365 days2025: Moderate 102 of 365 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 year0501001501980: 90th percentile AQI 1121981: 90th percentile AQI 901982: 90th percentile AQI 901983: 90th percentile AQI 1001987: 90th percentile AQI 1081988: 90th percentile AQI 1221989: 90th percentile AQI 671990: 90th percentile AQI 801991: 90th percentile AQI 901992: 90th percentile AQI 801993: 90th percentile AQI 1011994: 90th percentile AQI 901995: 90th percentile AQI 1011996: 90th percentile AQI 971997: 90th percentile AQI 901998: 90th percentile AQI 1121999: 90th percentile AQI 1052000: 90th percentile AQI 1002001: 90th percentile AQI 872002: 90th percentile AQI 842003: 90th percentile AQI 842004: 90th percentile AQI 772005: 90th percentile AQI 902006: 90th percentile AQI 842007: 90th percentile AQI 932008: 90th percentile AQI 772009: 90th percentile AQI 622010: 90th percentile AQI 742011: 90th percentile AQI 802012: 90th percentile AQI 742013: 90th percentile AQI 592014: 90th percentile AQI 612015: 90th percentile AQI 582016: 90th percentile AQI 572017: 90th percentile AQI 542018: 90th percentile AQI 622019: 90th percentile AQI 622020: 90th percentile AQI 592021: 90th percentile AQI 622022: 90th percentile AQI 612023: 90th percentile AQI 662024: 90th percentile AQI 582025: 90th percentile AQI 571980: Median AQI 561981: Median AQI 391982: Median AQI 361983: Median AQI 431987: Median AQI 451988: Median AQI 401989: Median AQI 381990: Median AQI 371991: Median AQI 431992: Median AQI 381993: Median AQI 441994: Median AQI 371995: Median AQI 411996: Median AQI 441997: Median AQI 391998: Median AQI 411999: Median AQI 512000: Median AQI 512001: Median AQI 452002: Median AQI 432003: Median AQI 462004: Median AQI 442005: Median AQI 462006: Median AQI 472007: Median AQI 502008: Median AQI 562009: Median AQI 412010: Median AQI 472011: Median AQI 462012: Median AQI 452013: Median AQI 432014: Median AQI 402015: Median AQI 392016: Median AQI 422017: Median AQI 402018: Median AQI 492019: Median AQI 492020: Median AQI 472021: Median AQI 492022: Median AQI 482023: Median AQI 492024: Median AQI 442025: Median AQI 421980198819931998200320082013201820232025
  • 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
Fine particles (PM2.5)23965%
Ozone12635%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253652631020000425778PM2.5
202436325410900004458100PM2.5
202336420415730004966135PM2.5
20223652011640000486197PM2.5
202135718916620004962105PM2.5
20203642101540000475989PM2.5
20193611891720000496293PM2.5
201836519417010004962115PM2.5
20173352775800004054100Ozone
20163332587410004257122Ozone
2015333265680000395887Ozone
2014338264740000406197Ozone
2013336255810000435990Ozone
2012338213111140004574147Ozone
201133119413340004680126Ozone
201033520512640004774136Ozone
20093492529610004162122Ozone
200836611624190005677147PM2.5
2007364185154232005093182Ozone
2006362206142122004784156Ozone
2005364209134210004690133Ozone
2004365222131120004477150Ozone
2003365208143140004684143Ozone
2002365227112242004384166Ozone
2001364212136160004587136Ozone
20003661791513060051100187Ozone
199936418013633150051105182Ozone
19983652576434100041112200Ozone
199736527769154003990156Ozone
1996366226107294004497169Ozone
1995365239893430041101169Ozone
199436527277142003790195Ozone
1993365244843241044101215Ozone
199236627572154003880185Ozone
199136524591272004390154Ozone
199036228267130003780136Ozone
19893652768360003867112Ozone
19883662436734202040122205Ozone
1987237149602260045108172Ozone
1983165119311131043100208Ozone
198231523164173003690185Ozone
198135225180210003990150Ozone
19803441541256050056112185NO2

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 Alabama with a similar median AQI in 2025

All monitored counties in Alabama

Source: U.S. EPA AirData, “Annual AQI by County” files for 1980–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem