EnviroNearby

Franklin County, New York air quality history

Daily Air Quality Index summaries from EPA monitors in Franklin, New York, 1986–2019.

100%
Good days in 2019
31
Median daily AQI, 2019
0
Days above 100 in 2019
177
Days with an AQI in 2019 (of 365)

In 2019, EPA reported a daily Air Quality Index (AQI) for Franklin, New York on 177 days. 177 of those days (100%) were in the Good range, and the median daily AQI was 31. That median is lower than the typical monitored county in New York (median 37 across 29 counties), and lower than the typical monitored U.S. county (41). The main pollutant was ozone on 177 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 100% in 2001–2003 versus 99% in 2016–2019.

EPA did not report an AQI for every day of 2019 here (177 of 365 days). Figures describe monitored days only; seasonal monitoring (for example, ozone measured only in warmer months) can make a county look cleaner or dirtier than a full-year record would.

The most recent year with data for this county is 2019; EPA's files for 2020–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (1991, 1992, 1993, 1994, 1995, 2000…) 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 42 of 42 days19861987: Good 55 of 55 days1988: Good 55 of 56 days1988: Moderate 1 of 56 days1989: Good 51 of 51 days1990: Good 57 of 57 days1991: Good 55 of 56 days1991: Moderate 1 of 56 days19911992: Good 56 of 56 days1993: Good 56 of 57 days1993: Moderate 1 of 57 days1994: Good 31 of 31 days1995: Good 23 of 23 days2000: Good 44 of 44 days20002001: Good 337 of 337 days2002: Good 355 of 357 days2002: Moderate 2 of 357 days2003: Good 355 of 356 days2003: Moderate 1 of 356 days2004: Good 365 of 366 days2004: Moderate 1 of 366 days2005: Good 309 of 358 days2005: Moderate 35 of 358 days2005: Unhealthy for Sensitive Groups 12 of 358 days2005: Unhealthy 2 of 358 days20052006: Good 327 of 345 days2006: Moderate 15 of 345 days2006: Unhealthy for Sensitive Groups 3 of 345 days2007: Good 340 of 362 days2007: Moderate 18 of 362 days2007: Unhealthy for Sensitive Groups 4 of 362 days2008: Good 354 of 365 days2008: Moderate 10 of 365 days2008: Unhealthy for Sensitive Groups 1 of 365 days2009: Good 308 of 316 days2009: Moderate 5 of 316 days2009: Unhealthy for Sensitive Groups 3 of 316 days2010: Good 337 of 338 days2010: Moderate 1 of 338 days20102011: Good 355 of 360 days2011: Moderate 4 of 360 days2011: Unhealthy for Sensitive Groups 1 of 360 days2012: Good 310 of 311 days2012: Moderate 1 of 311 days2013: Good 339 of 347 days2013: Moderate 7 of 347 days2013: Unhealthy for Sensitive Groups 1 of 347 days2014: Good 343 of 347 days2014: Moderate 4 of 347 days2015: Good 318 of 334 days2015: Moderate 12 of 334 days2015: Unhealthy for Sensitive Groups 4 of 334 days20152016: Good 359 of 360 days2016: Moderate 1 of 360 days2017: Good 337 of 345 days2017: Moderate 8 of 345 days2019: Good 177 of 177 days2019
  • 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 year0501001986: 90th percentile AQI 281987: 90th percentile AQI 361988: 90th percentile AQI 291989: 90th percentile AQI 271990: 90th percentile AQI 311991: 90th percentile AQI 361992: 90th percentile AQI 261993: 90th percentile AQI 231994: 90th percentile AQI 191995: 90th percentile AQI 292000: 90th percentile AQI 112001: 90th percentile AQI 222002: 90th percentile AQI 202003: 90th percentile AQI 232004: 90th percentile AQI 312005: 90th percentile AQI 612006: 90th percentile AQI 442007: 90th percentile AQI 452008: 90th percentile AQI 422009: 90th percentile AQI 432010: 90th percentile AQI 322011: 90th percentile AQI 252012: 90th percentile AQI 262013: 90th percentile AQI 432014: 90th percentile AQI 422015: 90th percentile AQI 452016: 90th percentile AQI 372017: 90th percentile AQI 422019: 90th percentile AQI 421986: Median AQI 171987: Median AQI 221988: Median AQI 141989: Median AQI 141990: Median AQI 121991: Median AQI 171992: Median AQI 161993: Median AQI 121994: Median AQI 101995: Median AQI 122000: Median AQI 62001: Median AQI 102002: Median AQI 92003: Median AQI 92004: Median AQI 102005: Median AQI 192006: Median AQI 202007: Median AQI 172008: Median AQI 232009: Median AQI 242010: Median AQI 122011: Median AQI 122012: Median AQI 122013: Median AQI 242014: Median AQI 252015: Median AQI 262016: Median AQI 212017: Median AQI 262019: Median AQI 311986199120002005201020152019
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2019

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
Ozone177100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
201917717700000314249Ozone
201734533780000264293Ozone
201636035910000213751Ozone
20153343181240002645119Ozone
201434734340000254279Ozone
2013347339710002443129Ozone
201231131010000122672Ozone
2011360355410001225104NO2
201033833710000123267Ozone
2009316308530002443147Ozone
20083653541010002342126Ozone
20073623401840001745143PM10
20063453271530002044133Ozone
200535830935122001961156Ozone
200436636510000103171PM10
20033563551000092351PM10
20023573552000092058PM10
200133733700000102244PM10
200044440000061114PM10
1995232300000122949PM10
1994313100000101931PM10
1993575610000122353PM10
1992565600000162645PM10
1991565510000173655PM10
1990575700000123144PM10
1989515100000142746PM10
1988565510000142951PM10
1987555500000223644PM10
1986424200000172844PM10

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 2019

All monitored counties in New York

Source: U.S. EPA AirData, “Annual AQI by County” files for 1986–2019 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem