EnviroNearby

Putnam County, New York air quality history

Daily Air Quality Index summaries from EPA monitors in Putnam, New York, 1990–2025.

94%
Good days in 2025
33
Median daily AQI, 2025
0
Days above 100 in 2025
343
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Putnam, New York on 343 days. 323 of those days (94%) were in the Good range, and the median daily AQI was 33. That median is lower than 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 343 days. Across the years with fuller monitoring, the share of Good days rose: an average of 76% in 1994–1996 versus 94% in 2023–2025.

Years with fewer than 120 monitored days (1990, 1991, 1992, 1993) 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%1990: Good 18 of 18 days19901991: Good 51 of 52 days1991: Moderate 1 of 52 days1992: Good 53 of 54 days1992: Moderate 1 of 54 days1993: Good 56 of 56 days1994: Good 162 of 204 days1994: Moderate 29 of 204 days1994: Unhealthy for Sensitive Groups 8 of 204 days1994: Unhealthy 5 of 204 days1995: Good 186 of 244 days1995: Moderate 32 of 244 days1995: Unhealthy for Sensitive Groups 18 of 244 days1995: Unhealthy 7 of 244 days1995: Very Unhealthy 1 of 244 days19951996: Good 161 of 222 days1996: Moderate 47 of 222 days1996: Unhealthy for Sensitive Groups 10 of 222 days1996: Unhealthy 4 of 222 days1997: Good 172 of 227 days1997: Moderate 36 of 227 days1997: Unhealthy for Sensitive Groups 13 of 227 days1997: Unhealthy 6 of 227 days1998: Good 146 of 222 days1998: Moderate 52 of 222 days1998: Unhealthy for Sensitive Groups 16 of 222 days1998: Unhealthy 8 of 222 days1999: Good 132 of 204 days1999: Moderate 46 of 204 days1999: Unhealthy for Sensitive Groups 13 of 204 days1999: Unhealthy 12 of 204 days1999: Very Unhealthy 1 of 204 days2000: Good 175 of 213 days2000: Moderate 25 of 213 days2000: Unhealthy for Sensitive Groups 12 of 213 days2000: Unhealthy 1 of 213 days20002001: Good 149 of 217 days2001: Moderate 44 of 217 days2001: Unhealthy for Sensitive Groups 15 of 217 days2001: Unhealthy 8 of 217 days2001: Very Unhealthy 1 of 217 days2002: Good 119 of 198 days2002: Moderate 44 of 198 days2002: Unhealthy for Sensitive Groups 17 of 198 days2002: Unhealthy 15 of 198 days2002: Very Unhealthy 3 of 198 days2003: Good 161 of 212 days2003: Moderate 39 of 212 days2003: Unhealthy for Sensitive Groups 10 of 212 days2003: Unhealthy 2 of 212 days2004: Good 177 of 220 days2004: Moderate 35 of 220 days2004: Unhealthy for Sensitive Groups 7 of 220 days2004: Unhealthy 1 of 220 days2005: Good 213 of 273 days2005: Moderate 39 of 273 days2005: Unhealthy for Sensitive Groups 15 of 273 days2005: Unhealthy 5 of 273 days2005: Very Unhealthy 1 of 273 days20052006: Good 301 of 341 days2006: Moderate 35 of 341 days2006: Unhealthy for Sensitive Groups 4 of 341 days2006: Unhealthy 1 of 341 days2007: Good 305 of 359 days2007: Moderate 37 of 359 days2007: Unhealthy for Sensitive Groups 14 of 359 days2007: Unhealthy 3 of 359 days2008: Good 315 of 358 days2008: Moderate 36 of 358 days2008: Unhealthy for Sensitive Groups 6 of 358 days2008: Unhealthy 1 of 358 days2009: Good 341 of 361 days2009: Moderate 17 of 361 days2009: Unhealthy for Sensitive Groups 3 of 361 days2010: Good 310 of 360 days2010: Moderate 42 of 360 days2010: Unhealthy for Sensitive Groups 6 of 360 days2010: Unhealthy 2 of 360 days20102011: Good 323 of 343 days2011: Moderate 17 of 343 days2011: Unhealthy for Sensitive Groups 3 of 343 days2012: Good 319 of 343 days2012: Moderate 21 of 343 days2012: Unhealthy for Sensitive Groups 3 of 343 days2013: Good 339 of 353 days2013: Moderate 13 of 353 days2013: Unhealthy for Sensitive Groups 1 of 353 days2014: Good 344 of 364 days2014: Moderate 20 of 364 days2015: Good 335 of 362 days2015: Moderate 25 of 362 days2015: Unhealthy for Sensitive Groups 2 of 362 days20152016: Good 317 of 356 days2016: Moderate 34 of 356 days2016: Unhealthy for Sensitive Groups 4 of 356 days2016: Unhealthy 1 of 356 days2017: Good 335 of 356 days2017: Moderate 18 of 356 days2017: Unhealthy for Sensitive Groups 3 of 356 days2018: Good 317 of 337 days2018: Moderate 18 of 337 days2018: Unhealthy for Sensitive Groups 1 of 337 days2018: Unhealthy 1 of 337 days2019: Good 313 of 329 days2019: Moderate 15 of 329 days2019: Unhealthy for Sensitive Groups 1 of 329 days2020: Good 308 of 314 days2020: Moderate 6 of 314 days20202021: Good 334 of 353 days2021: Moderate 18 of 353 days2021: Unhealthy for Sensitive Groups 1 of 353 days2022: Good 311 of 333 days2022: Moderate 22 of 333 days2023: Good 334 of 350 days2023: Moderate 13 of 350 days2023: Unhealthy for Sensitive Groups 3 of 350 days2024: Good 335 of 362 days2024: Moderate 20 of 362 days2024: Unhealthy for Sensitive Groups 7 of 362 days2025: Good 323 of 343 days2025: Moderate 20 of 343 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 year0501001501990: 90th percentile AQI 241991: 90th percentile AQI 281992: 90th percentile AQI 231993: 90th percentile AQI 231994: 90th percentile AQI 841995: 90th percentile AQI 1051996: 90th percentile AQI 841997: 90th percentile AQI 901998: 90th percentile AQI 1011999: 90th percentile AQI 1222000: 90th percentile AQI 742001: 90th percentile AQI 1192002: 90th percentile AQI 1432003: 90th percentile AQI 772004: 90th percentile AQI 672005: 90th percentile AQI 872006: 90th percentile AQI 542007: 90th percentile AQI 672008: 90th percentile AQI 582009: 90th percentile AQI 452010: 90th percentile AQI 672011: 90th percentile AQI 462012: 90th percentile AQI 462013: 90th percentile AQI 452014: 90th percentile AQI 472015: 90th percentile AQI 472016: 90th percentile AQI 512017: 90th percentile AQI 472018: 90th percentile AQI 452019: 90th percentile AQI 462020: 90th percentile AQI 442021: 90th percentile AQI 472022: 90th percentile AQI 472023: 90th percentile AQI 452024: 90th percentile AQI 472025: 90th percentile AQI 461990: Median AQI 131991: Median AQI 141992: Median AQI 131993: Median AQI 111994: Median AQI 351995: Median AQI 401996: Median AQI 411997: Median AQI 411998: Median AQI 441999: Median AQI 452000: Median AQI 362001: Median AQI 432002: Median AQI 452003: Median AQI 412004: Median AQI 372005: Median AQI 372006: Median AQI 332007: Median AQI 342008: Median AQI 342009: Median AQI 322010: Median AQI 362011: Median AQI 342012: Median AQI 292013: Median AQI 322014: Median AQI 322015: Median AQI 332016: Median AQI 352017: Median AQI 342018: Median AQI 312019: Median AQI 352020: Median AQI 332021: Median AQI 352022: Median AQI 342023: Median AQI 322024: Median AQI 332025: Median AQI 3319901995200020052010201520202025
  • 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
Ozone343100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025343323200000334697Ozone
20243623352070003347136Ozone
20233503341330003245140Ozone
20223333112200003447100Ozone
20213533341810003547112Ozone
202031430860000334464Ozone
20193293131510003546101Ozone
20183373171811003145151Ozone
20173563351830003447112Ozone
20163563173441003551156Ozone
20153623352520003347140Ozone
2014364344200000324797Ozone
20133533391310003245108Ozone
20123433192130002946119Ozone
20113433231730003446136Ozone
20103603104262003667166Ozone
20093613411730003245129Ozone
20083583153661003458166Ozone
200735930537143003467159Ozone
20063413013541003354172Ozone
200527321339155103787217Ozone
20042201773571003767192Ozone
200321216139102004177182Ozone
20021981194417153045143213Ozone
2001217149441581043119206Ozone
200021317525121003674187Ozone
19992041324613121045122201Ozone
1998222146521680044101179Ozone
199722717236136004190192Ozone
199622216147104004184182Ozone
1995244186321871040105202Ozone
19942041622985003584197Ozone
1993565600000112341PM10
1992545310000132371PM10
1991525110000142859PM10
1990181800000132427PM10

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 1990–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem