EnviroNearby

Cambria County, Pennsylvania air quality history

Daily Air Quality Index summaries from EPA monitors in Cambria, Pennsylvania, 1980–2025.

75%
Good days in 2025
41
Median daily AQI, 2025
1
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 Cambria, Pennsylvania on 365 days. 272 of those days (75%) were in the Good range, and the median daily AQI was 41. That median is about the same as the typical monitored county in Pennsylvania (median 40 across 38 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 200 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 69% in 1980–1982 versus 69% 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 216 of 351 days1980: Moderate 71 of 351 days1980: Unhealthy for Sensitive Groups 34 of 351 days1980: Unhealthy 20 of 351 days1980: Very Unhealthy 10 of 351 days19801981: Good 249 of 353 days1981: Moderate 76 of 353 days1981: Unhealthy for Sensitive Groups 22 of 353 days1981: Unhealthy 5 of 353 days1981: Very Unhealthy 1 of 353 days1982: Good 274 of 362 days1982: Moderate 65 of 362 days1982: Unhealthy for Sensitive Groups 18 of 362 days1982: Unhealthy 5 of 362 days1983: Good 271 of 363 days1983: Moderate 73 of 363 days1983: Unhealthy for Sensitive Groups 15 of 363 days1983: Unhealthy 4 of 363 days1984: Good 306 of 362 days1984: Moderate 39 of 362 days1984: Unhealthy for Sensitive Groups 12 of 362 days1984: Unhealthy 5 of 362 days1985: Good 264 of 358 days1985: Moderate 78 of 358 days1985: Unhealthy for Sensitive Groups 12 of 358 days1985: Unhealthy 4 of 358 days19851986: Good 283 of 364 days1986: Moderate 62 of 364 days1986: Unhealthy for Sensitive Groups 19 of 364 days1987: Good 271 of 363 days1987: Moderate 66 of 363 days1987: Unhealthy for Sensitive Groups 18 of 363 days1987: Unhealthy 7 of 363 days1987: Very Unhealthy 1 of 363 days1988: Good 273 of 357 days1988: Moderate 42 of 357 days1988: Unhealthy for Sensitive Groups 18 of 357 days1988: Unhealthy 17 of 357 days1988: Very Unhealthy 7 of 357 days1989: Good 300 of 364 days1989: Moderate 57 of 364 days1989: Unhealthy for Sensitive Groups 6 of 364 days1989: Unhealthy 1 of 364 days1990: Good 292 of 361 days1990: Moderate 57 of 361 days1990: Unhealthy for Sensitive Groups 10 of 361 days1990: Unhealthy 2 of 361 days19901991: Good 270 of 365 days1991: Moderate 64 of 365 days1991: Unhealthy for Sensitive Groups 21 of 365 days1991: Unhealthy 10 of 365 days1992: Good 316 of 365 days1992: Moderate 41 of 365 days1992: Unhealthy for Sensitive Groups 8 of 365 days1993: Good 292 of 365 days1993: Moderate 57 of 365 days1993: Unhealthy for Sensitive Groups 14 of 365 days1993: Unhealthy 2 of 365 days1994: Good 283 of 365 days1994: Moderate 66 of 365 days1994: Unhealthy for Sensitive Groups 14 of 365 days1994: Unhealthy 2 of 365 days1995: Good 294 of 365 days1995: Moderate 48 of 365 days1995: Unhealthy for Sensitive Groups 17 of 365 days1995: Unhealthy 6 of 365 days19951996: Good 299 of 357 days1996: Moderate 47 of 357 days1996: Unhealthy for Sensitive Groups 9 of 357 days1996: Unhealthy 2 of 357 days1997: Good 299 of 364 days1997: Moderate 45 of 364 days1997: Unhealthy for Sensitive Groups 14 of 364 days1997: Unhealthy 5 of 364 days1997: Very Unhealthy 1 of 364 days1998: Good 275 of 365 days1998: Moderate 58 of 365 days1998: Unhealthy for Sensitive Groups 20 of 365 days1998: Unhealthy 12 of 365 days1999: Good 228 of 365 days1999: Moderate 100 of 365 days1999: Unhealthy for Sensitive Groups 28 of 365 days1999: Unhealthy 8 of 365 days1999: Very Unhealthy 1 of 365 days2000: Good 237 of 366 days2000: Moderate 108 of 366 days2000: Unhealthy for Sensitive Groups 17 of 366 days2000: Unhealthy 4 of 366 days20002001: Good 215 of 365 days2001: Moderate 120 of 365 days2001: Unhealthy for Sensitive Groups 25 of 365 days2001: Unhealthy 5 of 365 days2002: Good 230 of 365 days2002: Moderate 104 of 365 days2002: Unhealthy for Sensitive Groups 26 of 365 days2002: Unhealthy 5 of 365 days2003: Good 246 of 365 days2003: Moderate 108 of 365 days2003: Unhealthy for Sensitive Groups 9 of 365 days2003: Unhealthy 2 of 365 days2004: Good 251 of 366 days2004: Moderate 108 of 366 days2004: Unhealthy for Sensitive Groups 7 of 366 days2005: Good 228 of 365 days2005: Moderate 122 of 365 days2005: Unhealthy for Sensitive Groups 14 of 365 days2005: Unhealthy 1 of 365 days20052006: Good 245 of 365 days2006: Moderate 110 of 365 days2006: Unhealthy for Sensitive Groups 10 of 365 days2007: Good 237 of 365 days2007: Moderate 122 of 365 days2007: Unhealthy for Sensitive Groups 6 of 365 days2008: Good 250 of 366 days2008: Moderate 114 of 366 days2008: Unhealthy for Sensitive Groups 2 of 366 days2009: Good 116 of 365 days2009: Moderate 248 of 365 days2009: Unhealthy for Sensitive Groups 1 of 365 days2010: Good 104 of 365 days2010: Moderate 251 of 365 days2010: Unhealthy for Sensitive Groups 10 of 365 days20102011: Good 128 of 361 days2011: Moderate 227 of 361 days2011: Unhealthy for Sensitive Groups 6 of 361 days2012: Good 145 of 366 days2012: Moderate 214 of 366 days2012: Unhealthy for Sensitive Groups 6 of 366 days2012: Unhealthy 1 of 366 days2013: Good 134 of 365 days2013: Moderate 228 of 365 days2013: Unhealthy for Sensitive Groups 3 of 365 days2014: Good 151 of 365 days2014: Moderate 212 of 365 days2014: Unhealthy for Sensitive Groups 2 of 365 days2015: Good 130 of 365 days2015: Moderate 235 of 365 days20152016: Good 211 of 366 days2016: Moderate 155 of 366 days2017: Good 121 of 364 days2017: Moderate 243 of 364 days2018: Good 230 of 363 days2018: Moderate 133 of 363 days2019: Good 229 of 365 days2019: Moderate 136 of 365 days2020: Good 228 of 366 days2020: Moderate 138 of 366 days20202021: Good 169 of 353 days2021: Moderate 183 of 353 days2021: Unhealthy for Sensitive Groups 1 of 353 days2022: Good 171 of 363 days2022: Moderate 191 of 363 days2022: Unhealthy for Sensitive Groups 1 of 363 days2023: Good 213 of 363 days2023: Moderate 147 of 363 days2023: Unhealthy 2 of 363 days2023: Very Unhealthy 1 of 363 days2024: Good 269 of 365 days2024: Moderate 96 of 365 days2025: Good 272 of 365 days2025: Moderate 92 of 365 days2025: Unhealthy for Sensitive Groups 1 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 year0501001501980: 90th percentile AQI 1431981: 90th percentile AQI 901982: 90th percentile AQI 811983: 90th percentile AQI 771984: 90th percentile AQI 641985: 90th percentile AQI 741986: 90th percentile AQI 741987: 90th percentile AQI 841988: 90th percentile AQI 1081989: 90th percentile AQI 641990: 90th percentile AQI 671991: 90th percentile AQI 901992: 90th percentile AQI 551993: 90th percentile AQI 771994: 90th percentile AQI 771995: 90th percentile AQI 771996: 90th percentile AQI 741997: 90th percentile AQI 741998: 90th percentile AQI 1001999: 90th percentile AQI 1012000: 90th percentile AQI 802001: 90th percentile AQI 932002: 90th percentile AQI 972003: 90th percentile AQI 742004: 90th percentile AQI 752005: 90th percentile AQI 812006: 90th percentile AQI 772007: 90th percentile AQI 772008: 90th percentile AQI 682009: 90th percentile AQI 742010: 90th percentile AQI 802011: 90th percentile AQI 802012: 90th percentile AQI 772013: 90th percentile AQI 722014: 90th percentile AQI 712015: 90th percentile AQI 712016: 90th percentile AQI 682017: 90th percentile AQI 692018: 90th percentile AQI 612019: 90th percentile AQI 622020: 90th percentile AQI 602021: 90th percentile AQI 652022: 90th percentile AQI 662023: 90th percentile AQI 672024: 90th percentile AQI 592025: 90th percentile AQI 581980: Median AQI 451981: Median AQI 411982: Median AQI 401983: Median AQI 401984: Median AQI 351985: Median AQI 411986: Median AQI 381987: Median AQI 401988: Median AQI 381989: Median AQI 361990: Median AQI 361991: Median AQI 401992: Median AQI 361993: Median AQI 361994: Median AQI 391995: Median AQI 341996: Median AQI 351997: Median AQI 361998: Median AQI 361999: Median AQI 422000: Median AQI 392001: Median AQI 442002: Median AQI 432003: Median AQI 402004: Median AQI 412005: Median AQI 422006: Median AQI 412007: Median AQI 412008: Median AQI 392009: Median AQI 562010: Median AQI 582011: Median AQI 562012: Median AQI 542013: Median AQI 542014: Median AQI 532015: Median AQI 542016: Median AQI 462017: Median AQI 552018: Median AQI 442019: Median AQI 452020: Median AQI 442021: Median AQI 512022: Median AQI 522023: Median AQI 462024: Median AQI 422025: 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
Ozone20055%
Fine particles (PM2.5)16345%
Carbon monoxide (CO)1<1%
Nitrogen dioxide (NO₂)1<1%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253652729210004158115Ozone
2024365269960000425987PM2.5
202336321314702104667201PM2.5
202236317119110005266119PM2.5
202135316918310005165130PM2.5
20203662281380000446090PM2.5
20193652291360000456289PM2.5
20183632301330000446193PM2.5
20173641212430000556992PM2.5
20163662111550000466897PM2.5
20153651302350000547197PM2.5
201436515121220005371108PM2.5
201336513422830005472129PM2.5
201236614521461005477159PM2.5
201136112822760005680122PM2.5
2010365104251100005880150PM2.5
200936511624810005674101PM2.5
200836625011420003968105Ozone
200736523712260004177129Ozone
2006365245110100004177116Ozone
2005365228122141004281151Ozone
200436625110870004175143Ozone
200336524610892004074190Ozone
2002365230104265004397179Ozone
2001365215120255004493177Ozone
2000366237108174003980182NO2
19993652281002881042101203Ozone
19983652755820120036100200Ozone
199736429945145103674207NO2
19963572994792003574159NO2
199536529448176003477166NO2
199436528366142003977164NO2
199336529257142003677166NO2
19923653164180003655143NO2
1991365270642110004090187NO2
199036129257102003667169NO2
19893643005761003664164NO2
19883572734218177038108221NO2
198736327166187104084204NO2
198636428362190003874150NO2
198535826478124004174200NO2
198436230639125003564187NO2
198336327173154004077169NO2
198236227465185004081185NO2
198135324976225104190204NO2
198035121671342010045143228NO2

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 Pennsylvania with a similar median AQI in 2025

All monitored counties in Pennsylvania

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