EnviroNearby

Morris County, New Jersey air quality history

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

84%
Good days in 2025
39
Median daily AQI, 2025
3
Days above 100 in 2025
326
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Morris, New Jersey on 326 days. 275 of those days (84%) 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 277 days. Across the years with fuller monitoring, the share of Good days rose: an average of 31% in 1980–1982 versus 85% in 2023–2025.

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 90 of 357 days1980: Moderate 199 of 357 days1980: Unhealthy for Sensitive Groups 31 of 357 days1980: Unhealthy 24 of 357 days1980: Very Unhealthy 13 of 357 days19801981: Good 103 of 362 days1981: Moderate 190 of 362 days1981: Unhealthy for Sensitive Groups 39 of 362 days1981: Unhealthy 26 of 362 days1981: Very Unhealthy 4 of 362 days1982: Good 147 of 361 days1982: Moderate 168 of 361 days1982: Unhealthy for Sensitive Groups 28 of 361 days1982: Unhealthy 11 of 361 days1982: Very Unhealthy 7 of 361 days1983: Good 123 of 364 days1983: Moderate 174 of 364 days1983: Unhealthy for Sensitive Groups 37 of 364 days1983: Unhealthy 19 of 364 days1983: Very Unhealthy 11 of 364 days1984: Good 133 of 366 days1984: Moderate 190 of 366 days1984: Unhealthy for Sensitive Groups 30 of 366 days1984: Unhealthy 11 of 366 days1984: Very Unhealthy 2 of 366 days1985: Good 170 of 365 days1985: Moderate 138 of 365 days1985: Unhealthy for Sensitive Groups 40 of 365 days1985: Unhealthy 15 of 365 days1985: Very Unhealthy 2 of 365 days19851986: Good 190 of 365 days1986: Moderate 124 of 365 days1986: Unhealthy for Sensitive Groups 25 of 365 days1986: Unhealthy 18 of 365 days1986: Very Unhealthy 8 of 365 days1987: Good 211 of 365 days1987: Moderate 104 of 365 days1987: Unhealthy for Sensitive Groups 28 of 365 days1987: Unhealthy 18 of 365 days1987: Very Unhealthy 4 of 365 days1988: Good 218 of 366 days1988: Moderate 94 of 366 days1988: Unhealthy for Sensitive Groups 19 of 366 days1988: Unhealthy 16 of 366 days1988: Very Unhealthy 19 of 366 days1989: Good 236 of 365 days1989: Moderate 92 of 365 days1989: Unhealthy for Sensitive Groups 21 of 365 days1989: Unhealthy 14 of 365 days1989: Very Unhealthy 2 of 365 days1990: Good 246 of 364 days1990: Moderate 78 of 364 days1990: Unhealthy for Sensitive Groups 21 of 364 days1990: Unhealthy 16 of 364 days1990: Very Unhealthy 3 of 364 days19901991: Good 238 of 365 days1991: Moderate 75 of 365 days1991: Unhealthy for Sensitive Groups 21 of 365 days1991: Unhealthy 25 of 365 days1991: Very Unhealthy 6 of 365 days1992: Good 282 of 365 days1992: Moderate 57 of 365 days1992: Unhealthy for Sensitive Groups 17 of 365 days1992: Unhealthy 9 of 365 days1993: Good 265 of 365 days1993: Moderate 57 of 365 days1993: Unhealthy for Sensitive Groups 31 of 365 days1993: Unhealthy 9 of 365 days1993: Very Unhealthy 3 of 365 days1994: Good 248 of 365 days1994: Moderate 74 of 365 days1994: Unhealthy for Sensitive Groups 32 of 365 days1994: Unhealthy 10 of 365 days1994: Very Unhealthy 1 of 365 days1995: Good 257 of 365 days1995: Moderate 61 of 365 days1995: Unhealthy for Sensitive Groups 28 of 365 days1995: Unhealthy 15 of 365 days1995: Very Unhealthy 4 of 365 days19951996: Good 282 of 365 days1996: Moderate 47 of 365 days1996: Unhealthy for Sensitive Groups 25 of 365 days1996: Unhealthy 11 of 365 days1997: Good 286 of 365 days1997: Moderate 45 of 365 days1997: Unhealthy for Sensitive Groups 21 of 365 days1997: Unhealthy 13 of 365 days1998: Good 256 of 365 days1998: Moderate 62 of 365 days1998: Unhealthy for Sensitive Groups 27 of 365 days1998: Unhealthy 20 of 365 days1999: Good 238 of 365 days1999: Moderate 86 of 365 days1999: Unhealthy for Sensitive Groups 23 of 365 days1999: Unhealthy 16 of 365 days1999: Very Unhealthy 2 of 365 days2000: Good 240 of 366 days2000: Moderate 105 of 366 days2000: Unhealthy for Sensitive Groups 15 of 366 days2000: Unhealthy 5 of 366 days2000: Very Unhealthy 1 of 366 days20002001: Good 230 of 365 days2001: Moderate 93 of 365 days2001: Unhealthy for Sensitive Groups 33 of 365 days2001: Unhealthy 6 of 365 days2001: Very Unhealthy 3 of 365 days2002: Good 224 of 365 days2002: Moderate 88 of 365 days2002: Unhealthy for Sensitive Groups 26 of 365 days2002: Unhealthy 24 of 365 days2002: Very Unhealthy 3 of 365 days2003: Good 248 of 365 days2003: Moderate 97 of 365 days2003: Unhealthy for Sensitive Groups 16 of 365 days2003: Unhealthy 2 of 365 days2003: Very Unhealthy 2 of 365 days2004: Good 265 of 365 days2004: Moderate 91 of 365 days2004: Unhealthy for Sensitive Groups 9 of 365 days2005: Good 247 of 365 days2005: Moderate 96 of 365 days2005: Unhealthy for Sensitive Groups 20 of 365 days2005: Unhealthy 2 of 365 days20052006: Good 237 of 364 days2006: Moderate 101 of 364 days2006: Unhealthy for Sensitive Groups 19 of 364 days2006: Unhealthy 7 of 364 days2007: Good 238 of 365 days2007: Moderate 99 of 365 days2007: Unhealthy for Sensitive Groups 20 of 365 days2007: Unhealthy 8 of 365 days2008: Good 254 of 366 days2008: Moderate 99 of 366 days2008: Unhealthy for Sensitive Groups 12 of 366 days2008: Unhealthy 1 of 366 days2009: Good 296 of 365 days2009: Moderate 68 of 365 days2009: Unhealthy for Sensitive Groups 1 of 365 days2010: Good 260 of 365 days2010: Moderate 96 of 365 days2010: Unhealthy for Sensitive Groups 7 of 365 days2010: Unhealthy 2 of 365 days20102011: Good 283 of 365 days2011: Moderate 72 of 365 days2011: Unhealthy for Sensitive Groups 10 of 365 days2012: Good 272 of 359 days2012: Moderate 77 of 359 days2012: Unhealthy for Sensitive Groups 9 of 359 days2012: Unhealthy 1 of 359 days2013: Good 284 of 361 days2013: Moderate 71 of 361 days2013: Unhealthy for Sensitive Groups 6 of 361 days2014: Good 270 of 360 days2014: Moderate 89 of 360 days2014: Unhealthy for Sensitive Groups 1 of 360 days2015: Good 304 of 365 days2015: Moderate 58 of 365 days2015: Unhealthy for Sensitive Groups 3 of 365 days20152016: Good 312 of 364 days2016: Moderate 49 of 364 days2016: Unhealthy for Sensitive Groups 2 of 364 days2016: Unhealthy 1 of 364 days2017: Good 318 of 363 days2017: Moderate 42 of 363 days2017: Unhealthy for Sensitive Groups 3 of 363 days2018: Good 319 of 365 days2018: Moderate 41 of 365 days2018: Unhealthy for Sensitive Groups 5 of 365 days2019: Good 325 of 364 days2019: Moderate 39 of 364 days2020: Good 341 of 366 days2020: Moderate 25 of 366 days20202021: Good 327 of 363 days2021: Moderate 36 of 363 days2022: Good 320 of 360 days2022: Moderate 40 of 360 days2023: Good 314 of 363 days2023: Moderate 43 of 363 days2023: Unhealthy for Sensitive Groups 4 of 363 days2023: Unhealthy 2 of 363 days2024: Good 305 of 366 days2024: Moderate 59 of 366 days2024: Unhealthy for Sensitive Groups 2 of 366 days2025: Good 275 of 326 days2025: Moderate 48 of 326 days2025: Unhealthy for Sensitive Groups 3 of 326 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 1561981: 90th percentile AQI 1361982: 90th percentile AQI 1081983: 90th percentile AQI 1361984: 90th percentile AQI 1111985: 90th percentile AQI 1221986: 90th percentile AQI 1361987: 90th percentile AQI 1261988: 90th percentile AQI 1431989: 90th percentile AQI 1081990: 90th percentile AQI 1121991: 90th percentile AQI 1331992: 90th percentile AQI 871993: 90th percentile AQI 1151994: 90th percentile AQI 1121995: 90th percentile AQI 1121996: 90th percentile AQI 1001997: 90th percentile AQI 971998: 90th percentile AQI 1121999: 90th percentile AQI 1082000: 90th percentile AQI 802001: 90th percentile AQI 1122002: 90th percentile AQI 1292003: 90th percentile AQI 842004: 90th percentile AQI 742005: 90th percentile AQI 842006: 90th percentile AQI 902007: 90th percentile AQI 902008: 90th percentile AQI 742009: 90th percentile AQI 612010: 90th percentile AQI 802011: 90th percentile AQI 622012: 90th percentile AQI 662013: 90th percentile AQI 612014: 90th percentile AQI 662015: 90th percentile AQI 582016: 90th percentile AQI 552017: 90th percentile AQI 542018: 90th percentile AQI 562019: 90th percentile AQI 512020: 90th percentile AQI 482021: 90th percentile AQI 492022: 90th percentile AQI 522023: 90th percentile AQI 552024: 90th percentile AQI 582025: 90th percentile AQI 591980: Median AQI 701981: Median AQI 651982: Median AQI 551983: Median AQI 641984: Median AQI 571985: Median AQI 521986: Median AQI 501987: Median AQI 461988: Median AQI 451989: Median AQI 441990: Median AQI 431991: Median AQI 441992: Median AQI 401993: Median AQI 401994: Median AQI 431995: Median AQI 401996: Median AQI 391997: Median AQI 401998: Median AQI 401999: Median AQI 442000: Median AQI 422001: Median AQI 442002: Median AQI 432003: Median AQI 412004: Median AQI 392005: Median AQI 432006: Median AQI 412007: Median AQI 422008: Median AQI 402009: Median AQI 352010: Median AQI 392011: Median AQI 382012: Median AQI 372013: Median AQI 392014: Median AQI 402015: Median AQI 372016: Median AQI 352017: Median AQI 352018: Median AQI 352019: Median AQI 362020: Median AQI 352021: Median AQI 362022: Median AQI 362023: Median AQI 372024: Median AQI 372025: 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
Ozone27785%
Fine particles (PM2.5)4714%
Nitrogen dioxide (NO₂)21%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253262754830003959129Ozone
20243663055920003758108Ozone
20233633144342003755154Ozone
2022360320400000365284Ozone
2021363327360000364997Ozone
2020366341250000354884Ozone
2019364325390000365187Ozone
20183653194150003556136Ozone
20173633184230003554115Ozone
20163643124921003555151Ozone
20153653045830003758108Ozone
20143602708910004066112Ozone
20133612847160003961122Ozone
20123592727791003766156Ozone
201136528372100003862147Ozone
20103652609672003980172Ozone
20093652966810003561143Ozone
200836625499121004074151Ozone
200736523899208004290177Ozone
2006364237101197004190187Ozone
200536524796202004384164Ozone
20043652659190003974136Ozone
200336524897162204184204Ozone
20023652248826243043129225Ozone
2001365230933363044112203Ozone
2000366240105155104280209Ozone
19993652388623162044108213Ozone
19983652566227200040112197Ozone
1997365286452113004097200Ozone
19963652824725110039100197Ozone
19953652576128154040112214Ozone
19943652487432101043112204Ozone
1993365265573193040115205Ozone
199236528257179004087182Ozone
19913652387521256044133221Ozone
19903642467821163043112207Ozone
19893652369221142044108219Ozone
198836621894191619045143254Ozone
198736521110428184046126215Ozone
198636519012425188050136212Ozone
198536517013840152052122210CO
198436613319030112057111203CO
1983364123174371911064136262CO
198236114716828117055108248CO
198136210319039264065136214CO
198035790199312413070156227CO

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