EnviroNearby

Clearfield County, Pennsylvania air quality history

Daily Air Quality Index summaries from EPA monitors in Clearfield, Pennsylvania, 1996–2022.

98%
Good days in 2022
35
Median daily AQI, 2022
0
Days above 100 in 2022
219
Days with an AQI in 2022 (of 365)

In 2022, EPA reported a daily Air Quality Index (AQI) for Clearfield, Pennsylvania on 219 days. 215 of those days (98%) were in the Good range, and the median daily AQI was 35. That median is lower than the typical monitored county in Pennsylvania (median 43 across 40 counties), and lower than the typical monitored U.S. county (41). The main pollutant was ozone on 219 days. Across the years with fuller monitoring, the share of Good days rose: an average of 58% in 1996–1998 versus 99% in 2020–2022.

EPA did not report an AQI for every day of 2022 here (219 of 365 days). Figures describe monitored days only; seasonal monitoring (for example, ozone measured only in warmer months) can make a county look cleaner or dirtier than a full-year record would.

The most recent year with data for this county is 2022; EPA's files for 2023–2025 contain no row for it, which usually means its monitors stopped reporting.

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%1996: Good 122 of 152 days1996: Moderate 26 of 152 days1996: Unhealthy for Sensitive Groups 4 of 152 days19961997: Good 114 of 208 days1997: Moderate 63 of 208 days1997: Unhealthy for Sensitive Groups 19 of 208 days1997: Unhealthy 10 of 208 days1997: Very Unhealthy 2 of 208 days1998: Good 73 of 181 days1998: Moderate 61 of 181 days1998: Unhealthy for Sensitive Groups 33 of 181 days1998: Unhealthy 12 of 181 days1998: Very Unhealthy 2 of 181 days19981999: Good 139 of 214 days1999: Moderate 52 of 214 days1999: Unhealthy for Sensitive Groups 22 of 214 days1999: Unhealthy 1 of 214 days2000: Good 161 of 214 days2000: Moderate 39 of 214 days2000: Unhealthy for Sensitive Groups 12 of 214 days2000: Unhealthy 2 of 214 days20002001: Good 136 of 211 days2001: Moderate 55 of 211 days2001: Unhealthy for Sensitive Groups 13 of 211 days2001: Unhealthy 7 of 211 days2002: Good 115 of 194 days2002: Moderate 42 of 194 days2002: Unhealthy for Sensitive Groups 24 of 194 days2002: Unhealthy 13 of 194 days20022003: Good 132 of 187 days2003: Moderate 46 of 187 days2003: Unhealthy for Sensitive Groups 5 of 187 days2003: Unhealthy 4 of 187 days2004: Good 159 of 212 days2004: Moderate 47 of 212 days2004: Unhealthy for Sensitive Groups 6 of 212 days20042005: Good 115 of 208 days2005: Moderate 66 of 208 days2005: Unhealthy for Sensitive Groups 23 of 208 days2005: Unhealthy 4 of 208 days2006: Good 160 of 205 days2006: Moderate 40 of 205 days2006: Unhealthy for Sensitive Groups 5 of 205 days20062007: Good 151 of 203 days2007: Moderate 46 of 203 days2007: Unhealthy for Sensitive Groups 6 of 203 days2008: Good 135 of 204 days2008: Moderate 60 of 204 days2008: Unhealthy for Sensitive Groups 9 of 204 days20082009: Good 175 of 206 days2009: Moderate 28 of 206 days2009: Unhealthy for Sensitive Groups 3 of 206 days2010: Good 135 of 206 days2010: Moderate 56 of 206 days2010: Unhealthy for Sensitive Groups 15 of 206 days20102011: Good 248 of 291 days2011: Moderate 37 of 291 days2011: Unhealthy for Sensitive Groups 6 of 291 days2012: Good 290 of 342 days2012: Moderate 46 of 342 days2012: Unhealthy for Sensitive Groups 5 of 342 days2012: Unhealthy 1 of 342 days20122013: Good 313 of 347 days2013: Moderate 34 of 347 days2014: Good 250 of 263 days2014: Moderate 13 of 263 days20142015: Good 292 of 336 days2015: Moderate 44 of 336 days2016: Good 305 of 338 days2016: Moderate 32 of 338 days2016: Unhealthy for Sensitive Groups 1 of 338 days20162017: Good 317 of 346 days2017: Moderate 29 of 346 days2018: Good 320 of 343 days2018: Moderate 22 of 343 days2018: Unhealthy for Sensitive Groups 1 of 343 days20182019: Good 357 of 359 days2019: Moderate 2 of 359 days2020: Good 341 of 343 days2020: Moderate 2 of 343 days20202021: Good 274 of 277 days2021: Moderate 3 of 277 days2022: Good 215 of 219 days2022: Moderate 4 of 219 days2022
  • 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 year0501001501996: 90th percentile AQI 771997: 90th percentile AQI 1221998: 90th percentile AQI 1361999: 90th percentile AQI 1052000: 90th percentile AQI 872001: 90th percentile AQI 972002: 90th percentile AQI 1402003: 90th percentile AQI 842004: 90th percentile AQI 712005: 90th percentile AQI 1082006: 90th percentile AQI 712007: 90th percentile AQI 842008: 90th percentile AQI 872009: 90th percentile AQI 612010: 90th percentile AQI 932011: 90th percentile AQI 612012: 90th percentile AQI 612013: 90th percentile AQI 502014: 90th percentile AQI 462015: 90th percentile AQI 542016: 90th percentile AQI 502017: 90th percentile AQI 492018: 90th percentile AQI 462019: 90th percentile AQI 442020: 90th percentile AQI 422021: 90th percentile AQI 442022: 90th percentile AQI 441996: Median AQI 411997: Median AQI 481998: Median AQI 641999: Median AQI 462000: Median AQI 442001: Median AQI 462002: Median AQI 442003: Median AQI 442004: Median AQI 422005: Median AQI 482006: Median AQI 412007: Median AQI 412008: Median AQI 442009: Median AQI 382010: Median AQI 452011: Median AQI 392012: Median AQI 352013: Median AQI 362014: Median AQI 322015: Median AQI 382016: Median AQI 382017: Median AQI 362018: Median AQI 332019: Median AQI 332020: Median AQI 312021: Median AQI 332022: Median AQI 3519961998200020022004200620082010201220142016201820202022
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2022

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
Ozone219100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202221921540000354497Ozone
202127727430000334454Ozone
202034334120000314254Ozone
201935935720000334461Ozone
20183433202210003346101Ozone
2017346317290000364984Ozone
20163383053210003850119Ozone
20153362924400003854100Ozone
2014263250130000324693Ozone
2013347313340000365097Ozone
20123422904651003561164Ozone
20112912483760003961143Ozone
201020613556150004593136Ozone
20092061752830003861105Ozone
20082041356090004487126Ozone
20072031514660004184126Ozone
20062051604050004171136Ozone
2005208115662340048108161Ozone
20042121594760004271129Ozone
20031871324654004484192Ozone
20021941154224130044140187Ozone
200121113655137004697182Ozone
200021416139122004487197Ozone
1999214139522210046105156Ozone
1998181736133122064136213Ozone
19972081146319102048122204Ozone
19961521222640004177108Ozone

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 2022

All monitored counties in Pennsylvania

Source: U.S. EPA AirData, “Annual AQI by County” files for 1996–2022 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem