EnviroNearby

Gloucester County, New Jersey air quality history

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

79%
Good days in 2025
39
Median daily AQI, 2025
3
Days above 100 in 2025
357
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Gloucester, New Jersey on 357 days. 281 of those days (79%) were in the Good range, and the median daily AQI was 39. 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 208 days. Across the years with fuller monitoring, the share of Good days rose: an average of 60% in 1982–1984 versus 75% in 2023–2025.

Years with fewer than 120 monitored days (1980, 1981) 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 40 of 46 days1980: Moderate 6 of 46 days19801981: Good 10 of 10 days1982: Good 198 of 329 days1982: Moderate 61 of 329 days1982: Unhealthy for Sensitive Groups 40 of 329 days1982: Unhealthy 23 of 329 days1982: Very Unhealthy 7 of 329 days1983: Good 170 of 354 days1983: Moderate 98 of 354 days1983: Unhealthy for Sensitive Groups 44 of 354 days1983: Unhealthy 28 of 354 days1983: Very Unhealthy 14 of 354 days1984: Good 261 of 360 days1984: Moderate 45 of 360 days1984: Unhealthy for Sensitive Groups 27 of 360 days1984: Unhealthy 19 of 360 days1984: Very Unhealthy 8 of 360 days1985: Good 242 of 357 days1985: Moderate 54 of 357 days1985: Unhealthy for Sensitive Groups 34 of 357 days1985: Unhealthy 23 of 357 days1985: Very Unhealthy 4 of 357 days19851986: Good 266 of 357 days1986: Moderate 44 of 357 days1986: Unhealthy for Sensitive Groups 23 of 357 days1986: Unhealthy 21 of 357 days1986: Very Unhealthy 3 of 357 days1987: Good 254 of 348 days1987: Moderate 32 of 348 days1987: Unhealthy for Sensitive Groups 32 of 348 days1987: Unhealthy 20 of 348 days1987: Very Unhealthy 10 of 348 days1988: Good 263 of 353 days1988: Moderate 33 of 353 days1988: Unhealthy for Sensitive Groups 18 of 353 days1988: Unhealthy 19 of 353 days1988: Very Unhealthy 20 of 353 days1989: Good 260 of 346 days1989: Moderate 44 of 346 days1989: Unhealthy for Sensitive Groups 22 of 346 days1989: Unhealthy 18 of 346 days1989: Very Unhealthy 2 of 346 days1990: Good 257 of 353 days1990: Moderate 48 of 353 days1990: Unhealthy for Sensitive Groups 31 of 353 days1990: Unhealthy 12 of 353 days1990: Very Unhealthy 5 of 353 days19901991: Good 238 of 357 days1991: Moderate 55 of 357 days1991: Unhealthy for Sensitive Groups 33 of 357 days1991: Unhealthy 20 of 357 days1991: Very Unhealthy 11 of 357 days1992: Good 280 of 361 days1992: Moderate 39 of 361 days1992: Unhealthy for Sensitive Groups 26 of 361 days1992: Unhealthy 15 of 361 days1992: Very Unhealthy 1 of 361 days1993: Good 254 of 355 days1993: Moderate 40 of 355 days1993: Unhealthy for Sensitive Groups 32 of 355 days1993: Unhealthy 25 of 355 days1993: Very Unhealthy 4 of 355 days1994: Good 272 of 359 days1994: Moderate 45 of 359 days1994: Unhealthy for Sensitive Groups 36 of 359 days1994: Unhealthy 6 of 359 days1995: Good 261 of 359 days1995: Moderate 62 of 359 days1995: Unhealthy for Sensitive Groups 22 of 359 days1995: Unhealthy 7 of 359 days1995: Very Unhealthy 7 of 359 days19951996: Good 265 of 356 days1996: Moderate 58 of 356 days1996: Unhealthy for Sensitive Groups 23 of 356 days1996: Unhealthy 10 of 356 days1997: Good 277 of 359 days1997: Moderate 43 of 359 days1997: Unhealthy for Sensitive Groups 23 of 359 days1997: Unhealthy 13 of 359 days1997: Very Unhealthy 3 of 359 days1998: Good 259 of 365 days1998: Moderate 54 of 365 days1998: Unhealthy for Sensitive Groups 32 of 365 days1998: Unhealthy 19 of 365 days1998: Very Unhealthy 1 of 365 days1999: Good 250 of 364 days1999: Moderate 75 of 364 days1999: Unhealthy for Sensitive Groups 18 of 364 days1999: Unhealthy 18 of 364 days1999: Very Unhealthy 3 of 364 days2000: Good 230 of 365 days2000: Moderate 107 of 365 days2000: Unhealthy for Sensitive Groups 20 of 365 days2000: Unhealthy 5 of 365 days2000: Very Unhealthy 3 of 365 days20002001: Good 227 of 356 days2001: Moderate 97 of 356 days2001: Unhealthy for Sensitive Groups 17 of 356 days2001: Unhealthy 13 of 356 days2001: Very Unhealthy 2 of 356 days2002: Good 224 of 362 days2002: Moderate 88 of 362 days2002: Unhealthy for Sensitive Groups 28 of 362 days2002: Unhealthy 12 of 362 days2002: Very Unhealthy 10 of 362 days2003: Good 236 of 365 days2003: Moderate 100 of 365 days2003: Unhealthy for Sensitive Groups 25 of 365 days2003: Unhealthy 2 of 365 days2003: Very Unhealthy 2 of 365 days2004: Good 248 of 364 days2004: Moderate 96 of 364 days2004: Unhealthy for Sensitive Groups 17 of 364 days2004: Unhealthy 3 of 364 days2005: Good 231 of 360 days2005: Moderate 101 of 360 days2005: Unhealthy for Sensitive Groups 22 of 360 days2005: Unhealthy 6 of 360 days20052006: Good 259 of 334 days2006: Moderate 54 of 334 days2006: Unhealthy for Sensitive Groups 18 of 334 days2006: Unhealthy 3 of 334 days2007: Good 230 of 340 days2007: Moderate 93 of 340 days2007: Unhealthy for Sensitive Groups 13 of 340 days2007: Unhealthy 4 of 340 days2008: Good 244 of 364 days2008: Moderate 97 of 364 days2008: Unhealthy for Sensitive Groups 18 of 364 days2008: Unhealthy 5 of 364 days2009: Good 278 of 363 days2009: Moderate 81 of 363 days2009: Unhealthy for Sensitive Groups 4 of 363 days2010: Good 254 of 365 days2010: Moderate 90 of 365 days2010: Unhealthy for Sensitive Groups 19 of 365 days2010: Unhealthy 2 of 365 days20102011: Good 238 of 333 days2011: Moderate 78 of 333 days2011: Unhealthy for Sensitive Groups 10 of 333 days2011: Unhealthy 7 of 333 days2012: Good 178 of 277 days2012: Moderate 78 of 277 days2012: Unhealthy for Sensitive Groups 17 of 277 days2012: Unhealthy 4 of 277 days2013: Good 217 of 292 days2013: Moderate 71 of 292 days2013: Unhealthy for Sensitive Groups 4 of 292 days2014: Good 170 of 242 days2014: Moderate 69 of 242 days2014: Unhealthy for Sensitive Groups 3 of 242 days2015: Good 182 of 272 days2015: Moderate 85 of 272 days2015: Unhealthy for Sensitive Groups 5 of 272 days20152016: Good 190 of 266 days2016: Moderate 69 of 266 days2016: Unhealthy for Sensitive Groups 7 of 266 days2017: Good 249 of 298 days2017: Moderate 43 of 298 days2017: Unhealthy for Sensitive Groups 6 of 298 days2018: Good 212 of 276 days2018: Moderate 57 of 276 days2018: Unhealthy for Sensitive Groups 7 of 276 days2019: Good 229 of 280 days2019: Moderate 50 of 280 days2019: Unhealthy for Sensitive Groups 1 of 280 days2020: Good 223 of 253 days2020: Moderate 29 of 253 days2020: Unhealthy for Sensitive Groups 1 of 253 days20202021: Good 238 of 297 days2021: Moderate 57 of 297 days2021: Unhealthy for Sensitive Groups 2 of 297 days2022: Good 217 of 288 days2022: Moderate 68 of 288 days2022: Unhealthy for Sensitive Groups 3 of 288 days2023: Good 236 of 321 days2023: Moderate 77 of 321 days2023: Unhealthy for Sensitive Groups 5 of 321 days2023: Unhealthy 3 of 321 days2024: Good 265 of 365 days2024: Moderate 92 of 365 days2024: Unhealthy for Sensitive Groups 8 of 365 days2025: Good 281 of 357 days2025: Moderate 73 of 357 days2025: Unhealthy for Sensitive Groups 3 of 357 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 year0501001502001980: 90th percentile AQI 541981: 90th percentile AQI 61982: 90th percentile AQI 1471983: 90th percentile AQI 1661984: 90th percentile AQI 1331985: 90th percentile AQI 1291986: 90th percentile AQI 1291987: 90th percentile AQI 1431988: 90th percentile AQI 1591989: 90th percentile AQI 1151990: 90th percentile AQI 1081991: 90th percentile AQI 1401992: 90th percentile AQI 1051993: 90th percentile AQI 1361994: 90th percentile AQI 1051995: 90th percentile AQI 1011996: 90th percentile AQI 1001997: 90th percentile AQI 1011998: 90th percentile AQI 1261999: 90th percentile AQI 1082000: 90th percentile AQI 902001: 90th percentile AQI 972002: 90th percentile AQI 1222003: 90th percentile AQI 902004: 90th percentile AQI 822005: 90th percentile AQI 842006: 90th percentile AQI 802007: 90th percentile AQI 852008: 90th percentile AQI 872009: 90th percentile AQI 642010: 90th percentile AQI 872011: 90th percentile AQI 742012: 90th percentile AQI 902013: 90th percentile AQI 662014: 90th percentile AQI 662015: 90th percentile AQI 742016: 90th percentile AQI 672017: 90th percentile AQI 612018: 90th percentile AQI 672019: 90th percentile AQI 572020: 90th percentile AQI 542021: 90th percentile AQI 592022: 90th percentile AQI 612023: 90th percentile AQI 692024: 90th percentile AQI 642025: 90th percentile AQI 581980: Median AQI 381981: Median AQI 31982: Median AQI 441983: Median AQI 521984: Median AQI 371985: Median AQI 361986: Median AQI 341987: Median AQI 321988: Median AQI 321989: Median AQI 321990: Median AQI 341991: Median AQI 341992: Median AQI 311993: Median AQI 321994: Median AQI 351995: Median AQI 351996: Median AQI 371997: Median AQI 361998: Median AQI 361999: Median AQI 402000: Median AQI 402001: Median AQI 422002: Median AQI 412003: Median AQI 422004: Median AQI 412005: Median AQI 432006: Median AQI 362007: Median AQI 392008: Median AQI 412009: Median AQI 362010: Median AQI 412011: Median AQI 422012: Median AQI 452013: Median AQI 422014: Median AQI 422015: Median AQI 432016: Median AQI 422017: Median AQI 392018: Median AQI 402019: Median AQI 372020: Median AQI 382021: Median AQI 402022: Median AQI 422023: Median AQI 432024: Median AQI 412025: Median AQI 391980198519901995200020052010201520202025
  • 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
Ozone20858%
Fine particles (PM2.5)14942%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253572817330003958143Ozone
20243652659280004164129Ozone
20233212367753004369185Ozone
20222882176830004261126Ozone
20212972385720004059101Ozone
20202532232910003854101Ozone
20192802295010003757133Ozone
20182762125770004067147Ozone
20172982494360003961126Ozone
20162661906970004267143Ozone
20152721828550004374133Ozone
20142421706930004266122Ozone
20132922177140004266126Ozone
201227717878174004590166Ozone
201133323878107004274192Ozone
201036525490192004187179Ozone
20093632788140003664119Ozone
200836424497185004187190Ozone
200734023093134003985192Ozone
200633425954183003680164Ozone
2005360231101226004384177Ozone
200436424896173004182177Ozone
2003365236100252204290219Ozone
200236222488281210041122222Ozone
2001356227971713204297203Ozone
2000365230107205304090219Ozone
19993642507518183040108212Ozone
19983652595432191036126205Ozone
19973592774323133036101216Ozone
19963562655823100037100192Ozone
1995359261622277035101222Ozone
1994359272453660035105172Ozone
19933552544032254032136204Ozone
19923612803926151031105214Ozone
199135723855332011034140232Ozone
19903532574831125034108212Ozone
19893462604422182032115217Ozone
198835326333181920032159240Ozone
198734825432322010032143235Ozone
19863572664423213034129216Ozone
19853572425434234036129206Ozone
19843602614527198037133216Ozone
198335417098442814052166276Ozone
19823291986140237044147233Ozone
1981101000000366Ozone
1980464060000385467CO

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