EnviroNearby

Passaic County, New Jersey air quality history

Daily Air Quality Index summaries from EPA monitors in Passaic, New Jersey, 1980–2025.

74%
Good days in 2025
41
Median daily AQI, 2025
4
Days above 100 in 2025
364
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Passaic, New Jersey on 364 days. 268 of those days (74%) were in the Good range, and the median daily AQI was 41. That median is about the same as the typical monitored county in New Jersey (median 40 across 15 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 184 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 71% in 1980–1999 versus 72% in 2023–2025.

Years with fewer than 120 monitored days (1992, 1993, 1994, 1995, 1996, 1997…) 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%1980: Good 261 of 326 days1980: Moderate 63 of 326 days1980: Unhealthy for Sensitive Groups 1 of 326 days1980: Unhealthy 1 of 326 days19801981: Good 50 of 53 days1981: Moderate 3 of 53 days1982: Good 39 of 47 days1982: Moderate 7 of 47 days1982: Unhealthy for Sensitive Groups 1 of 47 days1983: Good 13 of 13 days1984: Good 55 of 58 days1984: Moderate 3 of 58 days1985: Good 56 of 59 days1985: Moderate 3 of 59 days19851986: Good 53 of 61 days1986: Moderate 8 of 61 days1987: Good 50 of 61 days1987: Moderate 11 of 61 days1988: Good 52 of 61 days1988: Moderate 9 of 61 days1989: Good 55 of 61 days1989: Moderate 6 of 61 days1990: Good 55 of 61 days1990: Moderate 6 of 61 days19901991: Good 49 of 60 days1991: Moderate 11 of 60 days1992: Good 58 of 60 days1992: Moderate 2 of 60 days1993: Good 56 of 60 days1993: Moderate 4 of 60 days1994: Good 53 of 60 days1994: Moderate 7 of 60 days1995: Good 55 of 60 days1995: Moderate 5 of 60 days19951996: Good 50 of 50 days1997: Good 50 of 52 days1997: Moderate 2 of 52 days1998: Good 177 of 230 days1998: Moderate 28 of 230 days1998: Unhealthy for Sensitive Groups 18 of 230 days1998: Unhealthy 7 of 230 days1999: Good 138 of 251 days1999: Moderate 85 of 251 days1999: Unhealthy for Sensitive Groups 16 of 251 days1999: Unhealthy 12 of 251 days2000: Good 150 of 251 days2000: Moderate 85 of 251 days2000: Unhealthy for Sensitive Groups 15 of 251 days2000: Unhealthy 1 of 251 days20002001: Good 147 of 256 days2001: Moderate 87 of 256 days2001: Unhealthy for Sensitive Groups 14 of 256 days2001: Unhealthy 8 of 256 days2002: Good 145 of 267 days2002: Moderate 90 of 267 days2002: Unhealthy for Sensitive Groups 18 of 267 days2002: Unhealthy 13 of 267 days2002: Very Unhealthy 1 of 267 days2003: Good 159 of 253 days2003: Moderate 80 of 253 days2003: Unhealthy for Sensitive Groups 13 of 253 days2003: Unhealthy 1 of 253 days2004: Good 167 of 259 days2004: Moderate 82 of 259 days2004: Unhealthy for Sensitive Groups 8 of 259 days2004: Unhealthy 2 of 259 days2005: Good 151 of 254 days2005: Moderate 81 of 254 days2005: Unhealthy for Sensitive Groups 16 of 254 days2005: Unhealthy 6 of 254 days20052006: Good 160 of 246 days2006: Moderate 76 of 246 days2006: Unhealthy for Sensitive Groups 10 of 246 days2007: Good 150 of 250 days2007: Moderate 80 of 250 days2007: Unhealthy for Sensitive Groups 18 of 250 days2007: Unhealthy 2 of 250 days2008: Good 181 of 277 days2008: Moderate 87 of 277 days2008: Unhealthy for Sensitive Groups 9 of 277 days2009: Good 220 of 279 days2009: Moderate 57 of 279 days2009: Unhealthy for Sensitive Groups 2 of 279 days2010: Good 199 of 286 days2010: Moderate 77 of 286 days2010: Unhealthy for Sensitive Groups 9 of 286 days2010: Unhealthy 1 of 286 days20102011: Good 221 of 293 days2011: Moderate 65 of 293 days2011: Unhealthy for Sensitive Groups 7 of 293 days2012: Good 219 of 302 days2012: Moderate 77 of 302 days2012: Unhealthy for Sensitive Groups 5 of 302 days2012: Unhealthy 1 of 302 days2013: Good 223 of 287 days2013: Moderate 62 of 287 days2013: Unhealthy for Sensitive Groups 2 of 287 days2014: Good 213 of 283 days2014: Moderate 70 of 283 days2015: Good 205 of 279 days2015: Moderate 67 of 279 days2015: Unhealthy for Sensitive Groups 7 of 279 days20152016: Good 209 of 270 days2016: Moderate 56 of 270 days2016: Unhealthy for Sensitive Groups 5 of 270 days2017: Good 240 of 299 days2017: Moderate 58 of 299 days2017: Unhealthy for Sensitive Groups 1 of 299 days2018: Good 220 of 277 days2018: Moderate 54 of 277 days2018: Unhealthy for Sensitive Groups 3 of 277 days2019: Good 226 of 277 days2019: Moderate 50 of 277 days2019: Unhealthy for Sensitive Groups 1 of 277 days2020: Good 245 of 262 days2020: Moderate 17 of 262 days20202021: Good 243 of 261 days2021: Moderate 18 of 261 days2022: Good 251 of 304 days2022: Moderate 53 of 304 days2023: Good 241 of 353 days2023: Moderate 104 of 353 days2023: Unhealthy for Sensitive Groups 4 of 353 days2023: Unhealthy 4 of 353 days2024: Good 269 of 366 days2024: Moderate 95 of 366 days2024: Unhealthy for Sensitive Groups 2 of 366 days2025: Good 268 of 364 days2025: Moderate 92 of 364 days2025: Unhealthy for Sensitive Groups 4 of 364 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 601981: 90th percentile AQI 431982: 90th percentile AQI 671983: 90th percentile AQI 261984: 90th percentile AQI 441985: 90th percentile AQI 421986: 90th percentile AQI 511987: 90th percentile AQI 581988: 90th percentile AQI 531989: 90th percentile AQI 481990: 90th percentile AQI 501991: 90th percentile AQI 541992: 90th percentile AQI 391993: 90th percentile AQI 471994: 90th percentile AQI 521995: 90th percentile AQI 501996: 90th percentile AQI 431997: 90th percentile AQI 411998: 90th percentile AQI 1051999: 90th percentile AQI 1122000: 90th percentile AQI 872001: 90th percentile AQI 1002002: 90th percentile AQI 1092003: 90th percentile AQI 842004: 90th percentile AQI 772005: 90th percentile AQI 972006: 90th percentile AQI 772007: 90th percentile AQI 982008: 90th percentile AQI 772009: 90th percentile AQI 662010: 90th percentile AQI 742011: 90th percentile AQI 642012: 90th percentile AQI 692013: 90th percentile AQI 622014: 90th percentile AQI 642015: 90th percentile AQI 692016: 90th percentile AQI 622017: 90th percentile AQI 572018: 90th percentile AQI 642019: 90th percentile AQI 572020: 90th percentile AQI 472021: 90th percentile AQI 482022: 90th percentile AQI 542023: 90th percentile AQI 632024: 90th percentile AQI 612025: 90th percentile AQI 611980: Median AQI 391981: Median AQI 221982: Median AQI 341983: Median AQI 131984: Median AQI 211985: Median AQI 251986: Median AQI 331987: Median AQI 321988: Median AQI 271989: Median AQI 271990: Median AQI 261991: Median AQI 241992: Median AQI 211993: Median AQI 261994: Median AQI 291995: Median AQI 251996: Median AQI 251997: Median AQI 221998: Median AQI 341999: Median AQI 482000: Median AQI 462001: Median AQI 472002: Median AQI 472003: Median AQI 442004: Median AQI 432005: Median AQI 462006: Median AQI 442007: Median AQI 442008: Median AQI 432009: Median AQI 382010: Median AQI 422011: Median AQI 412012: Median AQI 412013: Median AQI 382014: Median AQI 412015: Median AQI 412016: Median AQI 412017: Median AQI 382018: Median AQI 392019: Median AQI 402020: Median AQI 372021: Median AQI 372022: Median AQI 382023: Median AQI 422024: Median AQI 382025: Median AQI 411980198519901995200020052010201520202025
  • 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
Ozone18451%
Fine particles (PM2.5)18049%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253642689240004161115Ozone
20243662699520003861119PM2.5
202335324110444004263199PM2.5
2022304251530000385490Ozone
2021261243180000374880Ozone
20202622451700003747100Ozone
20192772265010004057122Ozone
20182772205430003964150Ozone
20172992405810003857112Ozone
20162702095650004162136Ozone
20152792056770004169147Ozone
2014283213700000416497Ozone
20132872236220003862122Ozone
20123022197751004169154Ozone
20112932216570004164136Ozone
20102861997791004274172Ozone
20092792205720003866115Ozone
20082771818790004377133Ozone
200725015080182004498169Ozone
200624616076100004477150Ozone
200525415181166004697172Ozone
20042591678282004377174Ozone
200325315980131004484156Ozone
20022671459018131047109204Ozone
2001256147871480047100166Ozone
200025115085151004687179Ozone
19992511388516120048112195Ozone
1998230177281870034105174Ozone
1997525020000224161PM10
1996505000000254344PM10
1995605550000255059PM10
1994605370000295281PM10
1993605640000264762PM10
1992605820000213951PM10
19916049110000245463PM10
1990615560000265066PM10
1989615560000274861PM10
1988615290000275363PM10
19876150110000325875PM10
1986615380000335173PM10
1985595630000254254PM10
1984585530000214456PM10
1983131300000132643PM10
19824739710003467108CO
1981535030000224361CO
19803262616311003960166CO

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 Jersey with a similar median AQI in 2025

All monitored counties in New Jersey

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