EnviroNearby

Niagara County, New York air quality history

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

93%
Good days in 2025
34
Median daily AQI, 2025
1
Days above 100 in 2025
353
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Niagara, New York on 353 days. 328 of those days (93%) were in the Good range, and the median daily AQI was 34. That median is about the same as the typical monitored county in New York (median 36 across 27 counties), and lower than the typical monitored U.S. county (40). The main pollutant was ozone on 353 days. Across the years with fuller monitoring, the share of Good days rose: an average of 82% in 1980–1982 versus 93% 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 296 of 366 days1980: Moderate 32 of 366 days1980: Unhealthy for Sensitive Groups 27 of 366 days1980: Unhealthy 9 of 366 days1980: Very Unhealthy 2 of 366 days19801981: Good 315 of 365 days1981: Moderate 29 of 365 days1981: Unhealthy for Sensitive Groups 13 of 365 days1981: Unhealthy 8 of 365 days1982: Good 287 of 365 days1982: Moderate 52 of 365 days1982: Unhealthy for Sensitive Groups 18 of 365 days1982: Unhealthy 8 of 365 days1983: Good 301 of 365 days1983: Moderate 39 of 365 days1983: Unhealthy for Sensitive Groups 15 of 365 days1983: Unhealthy 9 of 365 days1983: Very Unhealthy 1 of 365 days1984: Good 311 of 366 days1984: Moderate 38 of 366 days1984: Unhealthy for Sensitive Groups 8 of 366 days1984: Unhealthy 8 of 366 days1984: Very Unhealthy 1 of 366 days1985: Good 298 of 365 days1985: Moderate 42 of 365 days1985: Unhealthy for Sensitive Groups 20 of 365 days1985: Unhealthy 5 of 365 days19851986: Good 307 of 365 days1986: Moderate 34 of 365 days1986: Unhealthy for Sensitive Groups 19 of 365 days1986: Unhealthy 5 of 365 days1987: Good 277 of 365 days1987: Moderate 49 of 365 days1987: Unhealthy for Sensitive Groups 22 of 365 days1987: Unhealthy 15 of 365 days1987: Very Unhealthy 2 of 365 days1988: Good 286 of 366 days1988: Moderate 38 of 366 days1988: Unhealthy for Sensitive Groups 16 of 366 days1988: Unhealthy 15 of 366 days1988: Very Unhealthy 11 of 366 days1989: Good 301 of 365 days1989: Moderate 50 of 365 days1989: Unhealthy for Sensitive Groups 13 of 365 days1989: Unhealthy 1 of 365 days1990: Good 309 of 364 days1990: Moderate 39 of 364 days1990: Unhealthy for Sensitive Groups 11 of 364 days1990: Unhealthy 5 of 364 days19901991: Good 306 of 365 days1991: Moderate 36 of 365 days1991: Unhealthy for Sensitive Groups 14 of 365 days1991: Unhealthy 9 of 365 days1992: Good 327 of 366 days1992: Moderate 30 of 366 days1992: Unhealthy for Sensitive Groups 6 of 366 days1992: Unhealthy 3 of 366 days1993: Good 309 of 365 days1993: Moderate 42 of 365 days1993: Unhealthy for Sensitive Groups 14 of 365 days1994: Good 304 of 365 days1994: Moderate 40 of 365 days1994: Unhealthy for Sensitive Groups 18 of 365 days1994: Unhealthy 3 of 365 days1995: Good 308 of 365 days1995: Moderate 40 of 365 days1995: Unhealthy for Sensitive Groups 11 of 365 days1995: Unhealthy 6 of 365 days19951996: Good 313 of 366 days1996: Moderate 42 of 366 days1996: Unhealthy for Sensitive Groups 8 of 366 days1996: Unhealthy 3 of 366 days1997: Good 325 of 364 days1997: Moderate 29 of 364 days1997: Unhealthy for Sensitive Groups 9 of 364 days1997: Unhealthy 1 of 364 days1998: Good 283 of 362 days1998: Moderate 53 of 362 days1998: Unhealthy for Sensitive Groups 21 of 362 days1998: Unhealthy 5 of 362 days1999: Good 272 of 365 days1999: Moderate 66 of 365 days1999: Unhealthy for Sensitive Groups 21 of 365 days1999: Unhealthy 6 of 365 days2000: Good 269 of 366 days2000: Moderate 88 of 366 days2000: Unhealthy for Sensitive Groups 7 of 366 days2000: Unhealthy 2 of 366 days20002001: Good 255 of 365 days2001: Moderate 83 of 365 days2001: Unhealthy for Sensitive Groups 18 of 365 days2001: Unhealthy 8 of 365 days2001: Very Unhealthy 1 of 365 days2002: Good 246 of 365 days2002: Moderate 94 of 365 days2002: Unhealthy for Sensitive Groups 9 of 365 days2002: Unhealthy 16 of 365 days2003: Good 269 of 364 days2003: Moderate 81 of 364 days2003: Unhealthy for Sensitive Groups 8 of 364 days2003: Unhealthy 4 of 364 days2003: Very Unhealthy 2 of 364 days2004: Good 279 of 366 days2004: Moderate 77 of 366 days2004: Unhealthy for Sensitive Groups 10 of 366 days2005: Good 242 of 359 days2005: Moderate 86 of 359 days2005: Unhealthy for Sensitive Groups 27 of 359 days2005: Unhealthy 4 of 359 days20052006: Good 269 of 361 days2006: Moderate 83 of 361 days2006: Unhealthy for Sensitive Groups 9 of 361 days2007: Good 171 of 365 days2007: Moderate 174 of 365 days2007: Unhealthy for Sensitive Groups 18 of 365 days2007: Unhealthy 2 of 365 days2008: Good 155 of 366 days2008: Moderate 207 of 366 days2008: Unhealthy for Sensitive Groups 4 of 366 days2009: Good 209 of 365 days2009: Moderate 154 of 365 days2009: Unhealthy for Sensitive Groups 2 of 365 days2010: Good 209 of 365 days2010: Moderate 150 of 365 days2010: Unhealthy for Sensitive Groups 6 of 365 days20102011: Good 176 of 362 days2011: Moderate 180 of 362 days2011: Unhealthy for Sensitive Groups 6 of 362 days2012: Good 173 of 347 days2012: Moderate 163 of 347 days2012: Unhealthy for Sensitive Groups 10 of 347 days2012: Unhealthy 1 of 347 days2013: Good 220 of 246 days2013: Moderate 25 of 246 days2013: Unhealthy for Sensitive Groups 1 of 246 days2014: Good 181 of 194 days2014: Moderate 13 of 194 days2015: Good 202 of 222 days2015: Moderate 19 of 222 days2015: Unhealthy for Sensitive Groups 1 of 222 days20152016: Good 197 of 220 days2016: Moderate 20 of 220 days2016: Unhealthy for Sensitive Groups 3 of 220 days2017: Good 229 of 249 days2017: Moderate 19 of 249 days2017: Unhealthy for Sensitive Groups 1 of 249 days2018: Good 294 of 320 days2018: Moderate 25 of 320 days2018: Unhealthy for Sensitive Groups 1 of 320 days2019: Good 339 of 352 days2019: Moderate 13 of 352 days2020: Good 340 of 359 days2020: Moderate 19 of 359 days20202021: Good 330 of 357 days2021: Moderate 26 of 357 days2021: Unhealthy for Sensitive Groups 1 of 357 days2022: Good 339 of 358 days2022: Moderate 18 of 358 days2022: Unhealthy for Sensitive Groups 1 of 358 days2023: Good 335 of 356 days2023: Moderate 21 of 356 days2024: Good 277 of 302 days2024: Moderate 24 of 302 days2024: Unhealthy for Sensitive Groups 1 of 302 days2025: Good 328 of 353 days2025: Moderate 24 of 353 days2025: Unhealthy for Sensitive Groups 1 of 353 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 1011981: 90th percentile AQI 671982: 90th percentile AQI 871983: 90th percentile AQI 841984: 90th percentile AQI 681985: 90th percentile AQI 841986: 90th percentile AQI 711987: 90th percentile AQI 1011988: 90th percentile AQI 1121989: 90th percentile AQI 711990: 90th percentile AQI 711991: 90th percentile AQI 841992: 90th percentile AQI 541993: 90th percentile AQI 671994: 90th percentile AQI 741995: 90th percentile AQI 711996: 90th percentile AQI 641997: 90th percentile AQI 511998: 90th percentile AQI 871999: 90th percentile AQI 872000: 90th percentile AQI 682001: 90th percentile AQI 872002: 90th percentile AQI 902003: 90th percentile AQI 712004: 90th percentile AQI 672005: 90th percentile AQI 972006: 90th percentile AQI 672007: 90th percentile AQI 802008: 90th percentile AQI 722009: 90th percentile AQI 642010: 90th percentile AQI 712011: 90th percentile AQI 712012: 90th percentile AQI 742013: 90th percentile AQI 552014: 90th percentile AQI 492015: 90th percentile AQI 502016: 90th percentile AQI 542017: 90th percentile AQI 482018: 90th percentile AQI 502019: 90th percentile AQI 442020: 90th percentile AQI 462021: 90th percentile AQI 482022: 90th percentile AQI 452023: 90th percentile AQI 462024: 90th percentile AQI 492025: 90th percentile AQI 481980: Median AQI 271981: Median AQI 311982: Median AQI 351983: Median AQI 311984: Median AQI 321985: Median AQI 351986: Median AQI 341987: Median AQI 351988: Median AQI 331989: Median AQI 331990: Median AQI 321991: Median AQI 331992: Median AQI 321993: Median AQI 331994: Median AQI 331995: Median AQI 331996: Median AQI 341997: Median AQI 321998: Median AQI 351999: Median AQI 402000: Median AQI 372001: Median AQI 412002: Median AQI 402003: Median AQI 362004: Median AQI 342005: Median AQI 392006: Median AQI 312007: Median AQI 522008: Median AQI 532009: Median AQI 482010: Median AQI 472011: Median AQI 512012: Median AQI 512013: Median AQI 362014: Median AQI 352015: Median AQI 362016: Median AQI 392017: Median AQI 352018: Median AQI 342019: Median AQI 352020: Median AQI 342021: Median AQI 342022: Median AQI 352023: Median AQI 332024: Median AQI 342025: Median AQI 341980198519901995200020052010201520202025
  • 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
Ozone353100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253533282410003448115Ozone
20243022772410003449105Ozone
2023356335210000334697Ozone
20223583391810003545133Ozone
20213573302610003448108Ozone
2020359340190000344687Ozone
2019352339130000354480Ozone
20183202942510003450101Ozone
20172492291910003548105Ozone
20162201972030003954119Ozone
20152222021910003650101Ozone
2014194181130000354990Ozone
20132462202510003655101Ozone
2012347173163101005174169PM2.5
201136217618060005171150PM2.5
201036520915060004771115PM2.5
200936520915420004864129PM2.5
200836615520740005372129PM2.5
2007365171174182005280159PM2.5
20063612698390003167133Ozone
200535924286274003997185Ozone
200436627977100003467140Ozone
20033642698184203671205Ozone
200236524694916004090192Ozone
200136525583188104187207Ozone
20003662698872003768156Ozone
199936527266216004087166Ozone
199836228353215003587172Ozone
19973643252991003251159Ozone
19963663134283003464174Ozone
199536530840116003371190Ozone
199436530440183003374161Ozone
199336530942140003367150Ozone
19923663273063003254182Ozone
199136530636149003384177Ozone
199036430939115003271192Ozone
198936530150131003371156Ozone
198836628638161511033112223Ozone
19873652774922152035101218Ozone
198636530734195003471197Ozone
198536529842205003584166Ozone
19843663113888103268208Ozone
198336530139159103184202Ozone
198236528752188003587185Ozone
198136531529138003167179Ozone
1980366296322792027101206Ozone

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