EnviroNearby

Monroe County, New York air quality history

Daily Air Quality Index summaries from EPA monitors in Monroe, New York, 1980–2025.

74%
Good days in 2025
39
Median daily AQI, 2025
7
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 Monroe, New York on 365 days. 271 of those days (74%) were in the Good range, and the median daily AQI was 39. That median is higher than the typical monitored county in New York (median 36 across 27 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 209 days. Across the years with fuller monitoring, the share of Good days fell: an average of 84% in 1980–1982 versus 71% 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 311 of 366 days1980: Moderate 36 of 366 days1980: Unhealthy for Sensitive Groups 12 of 366 days1980: Unhealthy 5 of 366 days1980: Very Unhealthy 2 of 366 days19801981: Good 296 of 365 days1981: Moderate 44 of 365 days1981: Unhealthy for Sensitive Groups 19 of 365 days1981: Unhealthy 4 of 365 days1981: Very Unhealthy 2 of 365 days1982: Good 310 of 365 days1982: Moderate 41 of 365 days1982: Unhealthy for Sensitive Groups 12 of 365 days1982: Unhealthy 2 of 365 days1983: Good 326 of 365 days1983: Moderate 24 of 365 days1983: Unhealthy for Sensitive Groups 9 of 365 days1983: Unhealthy 6 of 365 days1984: Good 321 of 366 days1984: Moderate 30 of 366 days1984: Unhealthy for Sensitive Groups 12 of 366 days1984: Unhealthy 3 of 366 days1985: Good 315 of 365 days1985: Moderate 32 of 365 days1985: Unhealthy for Sensitive Groups 16 of 365 days1985: Unhealthy 1 of 365 days1985: Very Unhealthy 1 of 365 days19851986: Good 311 of 365 days1986: Moderate 35 of 365 days1986: Unhealthy for Sensitive Groups 15 of 365 days1986: Unhealthy 4 of 365 days1987: Good 302 of 365 days1987: Moderate 37 of 365 days1987: Unhealthy for Sensitive Groups 16 of 365 days1987: Unhealthy 8 of 365 days1987: Very Unhealthy 2 of 365 days1988: Good 295 of 366 days1988: Moderate 35 of 366 days1988: Unhealthy for Sensitive Groups 16 of 366 days1988: Unhealthy 12 of 366 days1988: Very Unhealthy 8 of 366 days1989: Good 321 of 364 days1989: Moderate 30 of 364 days1989: Unhealthy for Sensitive Groups 9 of 364 days1989: Unhealthy 4 of 364 days1990: Good 315 of 365 days1990: Moderate 34 of 365 days1990: Unhealthy for Sensitive Groups 12 of 365 days1990: Unhealthy 4 of 365 days19901991: Good 310 of 365 days1991: Moderate 31 of 365 days1991: Unhealthy for Sensitive Groups 11 of 365 days1991: Unhealthy 13 of 365 days1992: Good 341 of 366 days1992: Moderate 22 of 366 days1992: Unhealthy for Sensitive Groups 3 of 366 days1993: Good 323 of 365 days1993: Moderate 36 of 365 days1993: Unhealthy for Sensitive Groups 6 of 365 days1994: Good 319 of 365 days1994: Moderate 32 of 365 days1994: Unhealthy for Sensitive Groups 13 of 365 days1994: Unhealthy 1 of 365 days1995: Good 334 of 365 days1995: Moderate 21 of 365 days1995: Unhealthy for Sensitive Groups 6 of 365 days1995: Unhealthy 4 of 365 days19951996: Good 330 of 366 days1996: Moderate 33 of 366 days1996: Unhealthy for Sensitive Groups 3 of 366 days1997: Good 328 of 365 days1997: Moderate 23 of 365 days1997: Unhealthy for Sensitive Groups 12 of 365 days1997: Unhealthy 2 of 365 days1998: Good 323 of 365 days1998: Moderate 32 of 365 days1998: Unhealthy for Sensitive Groups 10 of 365 days1999: Good 306 of 365 days1999: Moderate 43 of 365 days1999: Unhealthy for Sensitive Groups 11 of 365 days1999: Unhealthy 5 of 365 days2000: Good 285 of 366 days2000: Moderate 77 of 366 days2000: Unhealthy for Sensitive Groups 3 of 366 days2000: Unhealthy 1 of 366 days20002001: Good 259 of 365 days2001: Moderate 91 of 365 days2001: Unhealthy for Sensitive Groups 11 of 365 days2001: Unhealthy 4 of 365 days2002: Good 242 of 365 days2002: Moderate 97 of 365 days2002: Unhealthy for Sensitive Groups 14 of 365 days2002: Unhealthy 11 of 365 days2002: Very Unhealthy 1 of 365 days2003: Good 274 of 365 days2003: Moderate 80 of 365 days2003: Unhealthy for Sensitive Groups 8 of 365 days2003: Unhealthy 3 of 365 days2004: Good 294 of 355 days2004: Moderate 59 of 355 days2004: Unhealthy for Sensitive Groups 2 of 355 days2005: Good 267 of 365 days2005: Moderate 85 of 365 days2005: Unhealthy for Sensitive Groups 13 of 365 days20052006: Good 286 of 365 days2006: Moderate 74 of 365 days2006: Unhealthy for Sensitive Groups 5 of 365 days2007: Good 228 of 365 days2007: Moderate 125 of 365 days2007: Unhealthy for Sensitive Groups 11 of 365 days2007: Unhealthy 1 of 365 days2008: Good 212 of 366 days2008: Moderate 148 of 366 days2008: Unhealthy for Sensitive Groups 6 of 366 days2009: Good 252 of 365 days2009: Moderate 111 of 365 days2009: Unhealthy for Sensitive Groups 1 of 365 days2009: Unhealthy 1 of 365 days2010: Good 249 of 365 days2010: Moderate 109 of 365 days2010: Unhealthy for Sensitive Groups 7 of 365 days20102011: Good 255 of 345 days2011: Moderate 89 of 345 days2011: Unhealthy for Sensitive Groups 1 of 345 days2012: Good 239 of 366 days2012: Moderate 115 of 366 days2012: Unhealthy for Sensitive Groups 11 of 366 days2012: Unhealthy 1 of 366 days2013: Good 253 of 365 days2013: Moderate 112 of 365 days2014: Good 260 of 365 days2014: Moderate 105 of 365 days2015: Good 236 of 365 days2015: Moderate 129 of 365 days20152016: Good 251 of 366 days2016: Moderate 113 of 366 days2016: Unhealthy for Sensitive Groups 2 of 366 days2017: Good 246 of 365 days2017: Moderate 116 of 365 days2017: Unhealthy for Sensitive Groups 3 of 365 days2018: Good 248 of 365 days2018: Moderate 113 of 365 days2018: Unhealthy for Sensitive Groups 4 of 365 days2019: Good 272 of 365 days2019: Moderate 93 of 365 days2020: Good 275 of 366 days2020: Moderate 91 of 366 days20202021: Good 239 of 365 days2021: Moderate 126 of 365 days2022: Good 270 of 365 days2022: Moderate 93 of 365 days2022: Unhealthy for Sensitive Groups 2 of 365 days2023: Good 237 of 365 days2023: Moderate 120 of 365 days2023: Unhealthy for Sensitive Groups 3 of 365 days2023: Unhealthy 5 of 365 days2024: Good 271 of 366 days2024: Moderate 95 of 366 days2025: Good 271 of 365 days2025: Moderate 87 of 365 days2025: Unhealthy for Sensitive Groups 7 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 year0501001980: 90th percentile AQI 581981: 90th percentile AQI 801982: 90th percentile AQI 671983: 90th percentile AQI 601984: 90th percentile AQI 611985: 90th percentile AQI 671986: 90th percentile AQI 711987: 90th percentile AQI 801988: 90th percentile AQI 931989: 90th percentile AQI 581990: 90th percentile AQI 711991: 90th percentile AQI 871992: 90th percentile AQI 471993: 90th percentile AQI 581994: 90th percentile AQI 581995: 90th percentile AQI 491996: 90th percentile AQI 501997: 90th percentile AQI 511998: 90th percentile AQI 571999: 90th percentile AQI 712000: 90th percentile AQI 652001: 90th percentile AQI 772002: 90th percentile AQI 832003: 90th percentile AQI 672004: 90th percentile AQI 562005: 90th percentile AQI 772006: 90th percentile AQI 632007: 90th percentile AQI 742008: 90th percentile AQI 712009: 90th percentile AQI 612010: 90th percentile AQI 662011: 90th percentile AQI 612012: 90th percentile AQI 652013: 90th percentile AQI 622014: 90th percentile AQI 582015: 90th percentile AQI 632016: 90th percentile AQI 612017: 90th percentile AQI 582018: 90th percentile AQI 612019: 90th percentile AQI 572020: 90th percentile AQI 582021: 90th percentile AQI 612022: 90th percentile AQI 582023: 90th percentile AQI 642024: 90th percentile AQI 572025: 90th percentile AQI 611980: Median AQI 331981: Median AQI 361982: Median AQI 351983: Median AQI 291984: Median AQI 301985: Median AQI 311986: Median AQI 311987: Median AQI 341988: Median AQI 311989: Median AQI 301990: Median AQI 301991: Median AQI 311992: Median AQI 281993: Median AQI 311994: Median AQI 311995: Median AQI 311996: Median AQI 301997: Median AQI 301998: Median AQI 311999: Median AQI 242000: Median AQI 332001: Median AQI 382002: Median AQI 372003: Median AQI 352004: Median AQI 312005: Median AQI 332006: Median AQI 342007: Median AQI 432008: Median AQI 472009: Median AQI 412010: Median AQI 402011: Median AQI 382012: Median AQI 442013: Median AQI 422014: Median AQI 392015: Median AQI 432016: Median AQI 432017: Median AQI 432018: Median AQI 422019: Median AQI 402020: Median AQI 412021: Median AQI 432022: Median AQI 422023: Median AQI 422024: Median AQI 382025: Median AQI 391980198519901995200020052010201520202025
  • 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
Ozone20957%
Fine particles (PM2.5)15643%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253652718770003961135Ozone
2024366271950000385790PM2.5
202336523712035004264176PM2.5
20223652709320004258126PM2.5
202136523912600004361100PM2.5
2020366275910000415881PM2.5
2019365272930000405790PM2.5
201836524811340004261108PM2.5
201736524611630004358112PM2.5
201636625111320004361122PM2.5
20153652361290000436393PM2.5
20143652601050000395897PM2.5
20133652531120000426284PM2.5
2012366239115111004465151PM2.5
20113452558910003861112PM2.5
201036524910970004066108Ozone
200936525211111004161165PM2.5
200836621214860004771147PM2.5
2007365228125111004374156PM2.5
20063652867450003463143Ozone
200536526785130003377147Ozone
20043552945920003156106Ozone
20033652748083003567172Ozone
2002365242971411103783202Ozone
200136525991114003877178Ozone
20003662857731003365166Ozone
199936530643115002471164Ozone
199836532332100003157150Ozone
199736532823122003051177Ozone
19963663303330003050133Ozone
19953653342164003149179Ozone
199436531932131003158151Ozone
19933653233660003158119Ozone
19923663412230002847122Ozone
1991365310311113003187185Ozone
199036531534124003071200Ozone
19893643213094003058187Ozone
1988366295351612803193221Ozone
198736530237168203480203Ozone
198636531135154003171177Ozone
198536531532161103167202Ozone
198436632130123003061192Ozone
19833653262496002960182Ozone
198236531041122003567179Ozone
198136529644194203680213Ozone
198036631136125203358207Ozone

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 New York with a similar median AQI in 2025

All monitored counties in New York

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