EnviroNearby

Montgomery County, Alabama air quality history

Daily Air Quality Index summaries from EPA monitors in Montgomery, Alabama, 1986–2025.

64%
Good days in 2025
44
Median daily AQI, 2025
0
Days above 100 in 2025
359
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Montgomery, Alabama on 359 days. 229 of those days (64%) were in the Good range, and the median daily AQI was 44. That median is higher than the typical monitored county in Alabama (median 41 across 14 counties), and higher than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 287 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 56% in 1986–1988 versus 58% in 2023–2025.

Years with fewer than 120 monitored days (1992) are shown in the table but left out of comparisons and trend statements.

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%1986: Good 155 of 251 days1986: Moderate 50 of 251 days1986: Unhealthy for Sensitive Groups 33 of 251 days1986: Unhealthy 13 of 251 days19861987: Good 123 of 259 days1987: Moderate 67 of 259 days1987: Unhealthy for Sensitive Groups 43 of 259 days1987: Unhealthy 21 of 259 days1987: Very Unhealthy 5 of 259 days1988: Good 157 of 268 days1988: Moderate 60 of 268 days1988: Unhealthy for Sensitive Groups 39 of 268 days1988: Unhealthy 12 of 268 days1989: Good 227 of 270 days1989: Moderate 42 of 270 days1989: Unhealthy for Sensitive Groups 1 of 270 days1990: Good 184 of 247 days1990: Moderate 58 of 247 days1990: Unhealthy for Sensitive Groups 4 of 247 days1990: Unhealthy 1 of 247 days1991: Good 241 of 274 days1991: Moderate 31 of 274 days1991: Unhealthy for Sensitive Groups 2 of 274 days19911992: Good 60 of 61 days1992: Moderate 1 of 61 days1993: Good 189 of 233 days1993: Moderate 31 of 233 days1993: Unhealthy for Sensitive Groups 9 of 233 days1993: Unhealthy 4 of 233 days1994: Good 316 of 363 days1994: Moderate 39 of 363 days1994: Unhealthy for Sensitive Groups 7 of 363 days1994: Unhealthy 1 of 363 days1995: Good 305 of 363 days1995: Moderate 46 of 363 days1995: Unhealthy for Sensitive Groups 12 of 363 days1996: Good 337 of 366 days1996: Moderate 27 of 366 days1996: Unhealthy for Sensitive Groups 2 of 366 days19961997: Good 306 of 363 days1997: Moderate 55 of 363 days1997: Unhealthy for Sensitive Groups 2 of 363 days1998: Good 238 of 355 days1998: Moderate 87 of 355 days1998: Unhealthy for Sensitive Groups 19 of 355 days1998: Unhealthy 10 of 355 days1998: Very Unhealthy 1 of 355 days1999: Good 134 of 307 days1999: Moderate 146 of 307 days1999: Unhealthy for Sensitive Groups 22 of 307 days1999: Unhealthy 5 of 307 days2000: Good 99 of 281 days2000: Moderate 134 of 281 days2000: Unhealthy for Sensitive Groups 43 of 281 days2000: Unhealthy 5 of 281 days2001: Good 146 of 285 days2001: Moderate 129 of 285 days2001: Unhealthy for Sensitive Groups 10 of 285 days20012002: Good 176 of 316 days2002: Moderate 129 of 316 days2002: Unhealthy for Sensitive Groups 9 of 316 days2002: Unhealthy 2 of 316 days2003: Good 155 of 284 days2003: Moderate 125 of 284 days2003: Unhealthy for Sensitive Groups 4 of 284 days2004: Good 174 of 282 days2004: Moderate 105 of 282 days2004: Unhealthy for Sensitive Groups 3 of 282 days2005: Good 151 of 285 days2005: Moderate 132 of 285 days2005: Unhealthy for Sensitive Groups 2 of 285 days2006: Good 154 of 286 days2006: Moderate 123 of 286 days2006: Unhealthy for Sensitive Groups 8 of 286 days2006: Unhealthy 1 of 286 days20062007: Good 94 of 353 days2007: Moderate 240 of 353 days2007: Unhealthy for Sensitive Groups 14 of 353 days2007: Unhealthy 5 of 353 days2008: Good 124 of 349 days2008: Moderate 221 of 349 days2008: Unhealthy for Sensitive Groups 4 of 349 days2009: Good 136 of 323 days2009: Moderate 187 of 323 days2010: Good 106 of 364 days2010: Moderate 252 of 364 days2010: Unhealthy for Sensitive Groups 6 of 364 days2011: Good 158 of 278 days2011: Moderate 118 of 278 days2011: Unhealthy for Sensitive Groups 2 of 278 days20112012: Good 179 of 280 days2012: Moderate 100 of 280 days2012: Unhealthy for Sensitive Groups 1 of 280 days2013: Good 208 of 285 days2013: Moderate 77 of 285 days2014: Good 208 of 284 days2014: Moderate 76 of 284 days2015: Good 135 of 359 days2015: Moderate 223 of 359 days2015: Unhealthy for Sensitive Groups 1 of 359 days2016: Good 193 of 363 days2016: Moderate 168 of 363 days2016: Unhealthy for Sensitive Groups 1 of 363 days2016: Unhealthy 1 of 363 days20162017: Good 144 of 346 days2017: Moderate 199 of 346 days2017: Unhealthy for Sensitive Groups 2 of 346 days2017: Very Unhealthy 1 of 346 days2018: Good 81 of 324 days2018: Moderate 243 of 324 days2019: Good 84 of 365 days2019: Moderate 280 of 365 days2019: Unhealthy for Sensitive Groups 1 of 365 days2020: Good 70 of 361 days2020: Moderate 289 of 361 days2020: Unhealthy for Sensitive Groups 2 of 361 days2021: Good 222 of 354 days2021: Moderate 132 of 354 days20212022: Good 269 of 363 days2022: Moderate 94 of 363 days2023: Good 138 of 331 days2023: Moderate 193 of 331 days2024: Good 247 of 358 days2024: Moderate 110 of 358 days2024: Unhealthy for Sensitive Groups 1 of 358 days2025: Good 229 of 359 days2025: Moderate 130 of 359 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 year0501001502001986: 90th percentile AQI 1261987: 90th percentile AQI 1511988: 90th percentile AQI 1291989: 90th percentile AQI 611990: 90th percentile AQI 771991: 90th percentile AQI 541992: 90th percentile AQI 371993: 90th percentile AQI 741994: 90th percentile AQI 581995: 90th percentile AQI 641996: 90th percentile AQI 481997: 90th percentile AQI 641998: 90th percentile AQI 931999: 90th percentile AQI 972000: 90th percentile AQI 1152001: 90th percentile AQI 822002: 90th percentile AQI 802003: 90th percentile AQI 722004: 90th percentile AQI 702005: 90th percentile AQI 772006: 90th percentile AQI 802007: 90th percentile AQI 872008: 90th percentile AQI 742009: 90th percentile AQI 662010: 90th percentile AQI 732011: 90th percentile AQI 772012: 90th percentile AQI 662013: 90th percentile AQI 592014: 90th percentile AQI 612015: 90th percentile AQI 652016: 90th percentile AQI 612017: 90th percentile AQI 672018: 90th percentile AQI 702019: 90th percentile AQI 712020: 90th percentile AQI 702021: 90th percentile AQI 602022: 90th percentile AQI 572023: 90th percentile AQI 662024: 90th percentile AQI 572025: 90th percentile AQI 571986: Median AQI 441987: Median AQI 511988: Median AQI 461989: Median AQI 361990: Median AQI 431991: Median AQI 341992: Median AQI 211993: Median AQI 311994: Median AQI 321995: Median AQI 331996: Median AQI 311997: Median AQI 291998: Median AQI 371999: Median AQI 542000: Median AQI 582001: Median AQI 482002: Median AQI 472003: Median AQI 492004: Median AQI 442005: Median AQI 492006: Median AQI 482007: Median AQI 582008: Median AQI 552009: Median AQI 532010: Median AQI 562011: Median AQI 482012: Median AQI 462013: Median AQI 422014: Median AQI 432015: Median AQI 532016: Median AQI 482017: Median AQI 532018: Median AQI 572019: Median AQI 572020: Median AQI 582021: Median AQI 442022: Median AQI 412023: Median AQI 522024: Median AQI 422025: Median AQI 44198619911996200120062011201620212025
  • 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)28780%
Ozone7220%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253592291300000445790PM2.5
202435824711010004257102PM2.5
20233311381930000526693PM2.5
2022363269940000415796PM2.5
20213542221320000446093PM2.5
20203617028920005870116PM2.5
20193658428010005771122PM2.5
2018324812430000577093PM2.5
201734614419920105367246PM2.5
201636319316811004861176PM2.5
201535913522310005365115PM2.5
2014284208760000436187Ozone
2013285208770000425987Ozone
201228017910010004666102Ozone
201127815811820004877108Ozone
201036410625260005673129PM2.5
20093231361870000536693PM2.5
200834912422140005574122PM2.5
200735394240145005887160PM2.5
200628615412381004880184Ozone
200528515113220004977133Ozone
200428217410530004470124Ozone
200328415512540004972119Ozone
200231617612992004780154Ozone
2001285146129100004882150Ozone
2000281991344350058115195Ozone
1999307134146225005497200Ozone
1998355238871910103793216Ozone
19973633065520002964112Ozone
19963663372720003148140Ozone
199536330546120003364140Ozone
19943633163971003258164Ozone
19932331893194003174174Ozone
1992616010000213755PM10
19912742413120003454101Ozone
19902471845841004377151Ozone
19892702274210003661112Ozone
19882681576039120046129187Ozone
19872591236743215051151223Ozone
19862511555033130044126197Ozone

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 1986–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem