EnviroNearby

Rockland County, New York air quality history

Daily Air Quality Index summaries from EPA monitors in Rockland, New York, 1995–2025.

85%
Good days in 2025
37
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 Rockland, New York on 365 days. 312 of those days (85%) were in the Good range, and the median daily AQI was 37. 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 237 days. Across the years with fuller monitoring, the share of Good days rose: an average of 71% in 2009–2011 versus 83% in 2023–2025.

Years with fewer than 120 monitored days (1995, 1996, 1997, 1998) 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%1995: Good 13 of 13 days19951996: Good 57 of 58 days1996: Moderate 1 of 58 days1997: Good 58 of 58 days19971998: Good 57 of 57 days2009: Good 167 of 207 days2009: Moderate 40 of 207 days20092010: Good 248 of 365 days2010: Moderate 107 of 365 days2010: Unhealthy for Sensitive Groups 9 of 365 days2010: Unhealthy 1 of 365 days2011: Good 215 of 340 days2011: Moderate 116 of 340 days2011: Unhealthy for Sensitive Groups 9 of 340 days20112012: Good 247 of 360 days2012: Moderate 104 of 360 days2012: Unhealthy for Sensitive Groups 8 of 360 days2012: Unhealthy 1 of 360 days2013: Good 242 of 365 days2013: Moderate 120 of 365 days2013: Unhealthy for Sensitive Groups 3 of 365 days20132014: Good 264 of 365 days2014: Moderate 101 of 365 days2015: Good 249 of 365 days2015: Moderate 111 of 365 days2015: Unhealthy for Sensitive Groups 5 of 365 days20152016: Good 278 of 363 days2016: Moderate 81 of 363 days2016: Unhealthy for Sensitive Groups 4 of 363 days2017: Good 309 of 365 days2017: Moderate 55 of 365 days2017: Unhealthy for Sensitive Groups 1 of 365 days20172018: Good 301 of 365 days2018: Moderate 58 of 365 days2018: Unhealthy for Sensitive Groups 5 of 365 days2018: Very Unhealthy 1 of 365 days2019: Good 314 of 365 days2019: Moderate 50 of 365 days2019: Unhealthy for Sensitive Groups 1 of 365 days20192020: Good 319 of 366 days2020: Moderate 47 of 366 days2021: Good 314 of 362 days2021: Moderate 47 of 362 days2021: Unhealthy 1 of 362 days20212022: Good 315 of 365 days2022: Moderate 50 of 365 days2023: Good 288 of 363 days2023: Moderate 66 of 363 days2023: Unhealthy for Sensitive Groups 6 of 363 days2023: Unhealthy 3 of 363 days20232024: Good 308 of 366 days2024: Moderate 53 of 366 days2024: Unhealthy for Sensitive Groups 5 of 366 days2025: Good 312 of 365 days2025: Moderate 46 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 year0501001995: 90th percentile AQI 201996: 90th percentile AQI 311997: 90th percentile AQI 301998: 90th percentile AQI 382009: 90th percentile AQI 622010: 90th percentile AQI 712011: 90th percentile AQI 632012: 90th percentile AQI 672013: 90th percentile AQI 612014: 90th percentile AQI 592015: 90th percentile AQI 642016: 90th percentile AQI 612017: 90th percentile AQI 542018: 90th percentile AQI 572019: 90th percentile AQI 532020: 90th percentile AQI 532021: 90th percentile AQI 532022: 90th percentile AQI 532023: 90th percentile AQI 582024: 90th percentile AQI 542025: 90th percentile AQI 561995: Median AQI 111996: Median AQI 181997: Median AQI 151998: Median AQI 172009: Median AQI 352010: Median AQI 422011: Median AQI 442012: Median AQI 422013: Median AQI 432014: Median AQI 412015: Median AQI 422016: Median AQI 392017: Median AQI 382018: Median AQI 382019: Median AQI 392020: Median AQI 362021: Median AQI 372022: Median AQI 382023: Median AQI 382024: Median AQI 372025: Median AQI 3719951997200920112013201520172019202120232025
  • 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
Ozone23765%
Fine particles (PM2.5)12835%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253653124670003756136Ozone
20243663085350003754150Ozone
20233632886663003858197Ozone
2022365315500000385390Ozone
20213623144701003753155Ozone
2020366319470000365393Ozone
20193653145010003953112Ozone
20183653015850103857210Ozone
20173653095510003854105Ozone
20163632788140003961136Ozone
201536524911150004264143Ozone
201436526410100004159100Ozone
201336524212030004361143Ozone
201236024710481004267159Ozone
201134021511690004463122PM2.5
201036524810791004271156Ozone
20092071674000003562100Ozone
1998575700000173844PM10
1997585800000153048PM10
1996585710000183158PM10
1995131300000112021PM10

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 1995–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem