EnviroNearby

Berks County, Pennsylvania air quality history

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

68%
Good days in 2025
43
Median daily AQI, 2025
3
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 Berks, Pennsylvania on 365 days. 249 of those days (68%) were in the Good range, and the median daily AQI was 43. That median is higher than the typical monitored county in Pennsylvania (median 40 across 38 counties), and higher than the typical monitored U.S. county (40). The main pollutant was ozone on 232 days. Across the years with fuller monitoring, the share of Good days rose: an average of 61% in 1980–1982 versus 65% 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 211 of 361 days1980: Moderate 76 of 361 days1980: Unhealthy for Sensitive Groups 24 of 361 days1980: Unhealthy 29 of 361 days1980: Very Unhealthy 21 of 361 days19801981: Good 231 of 358 days1981: Moderate 76 of 358 days1981: Unhealthy for Sensitive Groups 28 of 358 days1981: Unhealthy 17 of 358 days1981: Very Unhealthy 6 of 358 days1982: Good 219 of 365 days1982: Moderate 101 of 365 days1982: Unhealthy for Sensitive Groups 25 of 365 days1982: Unhealthy 16 of 365 days1982: Very Unhealthy 4 of 365 days1983: Good 239 of 365 days1983: Moderate 72 of 365 days1983: Unhealthy for Sensitive Groups 30 of 365 days1983: Unhealthy 15 of 365 days1983: Very Unhealthy 9 of 365 days1984: Good 247 of 366 days1984: Moderate 86 of 366 days1984: Unhealthy for Sensitive Groups 22 of 366 days1984: Unhealthy 9 of 366 days1984: Very Unhealthy 2 of 366 days1985: Good 231 of 365 days1985: Moderate 95 of 365 days1985: Unhealthy for Sensitive Groups 26 of 365 days1985: Unhealthy 13 of 365 days19851986: Good 254 of 365 days1986: Moderate 82 of 365 days1986: Unhealthy for Sensitive Groups 20 of 365 days1986: Unhealthy 9 of 365 days1987: Good 235 of 365 days1987: Moderate 92 of 365 days1987: Unhealthy for Sensitive Groups 22 of 365 days1987: Unhealthy 14 of 365 days1987: Very Unhealthy 2 of 365 days1988: Good 240 of 366 days1988: Moderate 65 of 366 days1988: Unhealthy for Sensitive Groups 29 of 366 days1988: Unhealthy 16 of 366 days1988: Very Unhealthy 16 of 366 days1989: Good 258 of 365 days1989: Moderate 73 of 365 days1989: Unhealthy for Sensitive Groups 23 of 365 days1989: Unhealthy 11 of 365 days1990: Good 256 of 365 days1990: Moderate 79 of 365 days1990: Unhealthy for Sensitive Groups 17 of 365 days1990: Unhealthy 13 of 365 days19901991: Good 251 of 365 days1991: Moderate 68 of 365 days1991: Unhealthy for Sensitive Groups 27 of 365 days1991: Unhealthy 16 of 365 days1991: Very Unhealthy 3 of 365 days1992: Good 305 of 366 days1992: Moderate 47 of 366 days1992: Unhealthy for Sensitive Groups 10 of 366 days1992: Unhealthy 4 of 366 days1993: Good 270 of 365 days1993: Moderate 61 of 365 days1993: Unhealthy for Sensitive Groups 24 of 365 days1993: Unhealthy 10 of 365 days1994: Good 269 of 365 days1994: Moderate 72 of 365 days1994: Unhealthy for Sensitive Groups 21 of 365 days1994: Unhealthy 2 of 365 days1994: Very Unhealthy 1 of 365 days1995: Good 273 of 365 days1995: Moderate 60 of 365 days1995: Unhealthy for Sensitive Groups 21 of 365 days1995: Unhealthy 9 of 365 days1995: Very Unhealthy 2 of 365 days19951996: Good 276 of 366 days1996: Moderate 62 of 366 days1996: Unhealthy for Sensitive Groups 23 of 366 days1996: Unhealthy 5 of 366 days1997: Good 287 of 365 days1997: Moderate 51 of 365 days1997: Unhealthy for Sensitive Groups 18 of 365 days1997: Unhealthy 8 of 365 days1997: Very Unhealthy 1 of 365 days1998: Good 262 of 365 days1998: Moderate 60 of 365 days1998: Unhealthy for Sensitive Groups 26 of 365 days1998: Unhealthy 17 of 365 days1999: Good 217 of 365 days1999: Moderate 105 of 365 days1999: Unhealthy for Sensitive Groups 27 of 365 days1999: Unhealthy 14 of 365 days1999: Very Unhealthy 2 of 365 days2000: Good 231 of 366 days2000: Moderate 118 of 366 days2000: Unhealthy for Sensitive Groups 14 of 366 days2000: Unhealthy 3 of 366 days20002001: Good 206 of 365 days2001: Moderate 119 of 365 days2001: Unhealthy for Sensitive Groups 32 of 365 days2001: Unhealthy 7 of 365 days2001: Very Unhealthy 1 of 365 days2002: Good 218 of 365 days2002: Moderate 102 of 365 days2002: Unhealthy for Sensitive Groups 29 of 365 days2002: Unhealthy 16 of 365 days2003: Good 248 of 365 days2003: Moderate 99 of 365 days2003: Unhealthy for Sensitive Groups 16 of 365 days2003: Unhealthy 1 of 365 days2003: Very Unhealthy 1 of 365 days2004: Good 252 of 366 days2004: Moderate 104 of 366 days2004: Unhealthy for Sensitive Groups 9 of 366 days2004: Unhealthy 1 of 366 days2005: Good 227 of 365 days2005: Moderate 115 of 365 days2005: Unhealthy for Sensitive Groups 20 of 365 days2005: Unhealthy 3 of 365 days20052006: Good 201 of 313 days2006: Moderate 96 of 313 days2006: Unhealthy for Sensitive Groups 14 of 313 days2006: Unhealthy 2 of 313 days2007: Good 154 of 273 days2007: Moderate 99 of 273 days2007: Unhealthy for Sensitive Groups 19 of 273 days2007: Unhealthy 1 of 273 days2008: Good 239 of 366 days2008: Moderate 106 of 366 days2008: Unhealthy for Sensitive Groups 20 of 366 days2008: Unhealthy 1 of 366 days2009: Good 176 of 365 days2009: Moderate 182 of 365 days2009: Unhealthy for Sensitive Groups 7 of 365 days2010: Good 190 of 365 days2010: Moderate 149 of 365 days2010: Unhealthy for Sensitive Groups 23 of 365 days2010: Unhealthy 3 of 365 days20102011: Good 134 of 365 days2011: Moderate 220 of 365 days2011: Unhealthy for Sensitive Groups 11 of 365 days2012: Good 115 of 366 days2012: Moderate 238 of 366 days2012: Unhealthy for Sensitive Groups 13 of 366 days2013: Good 132 of 365 days2013: Moderate 221 of 365 days2013: Unhealthy for Sensitive Groups 12 of 365 days2014: Good 155 of 365 days2014: Moderate 202 of 365 days2014: Unhealthy for Sensitive Groups 8 of 365 days2015: Good 148 of 365 days2015: Moderate 211 of 365 days2015: Unhealthy for Sensitive Groups 6 of 365 days20152016: Good 136 of 366 days2016: Moderate 223 of 366 days2016: Unhealthy for Sensitive Groups 7 of 366 days2017: Good 184 of 365 days2017: Moderate 176 of 365 days2017: Unhealthy for Sensitive Groups 5 of 365 days2018: Good 226 of 365 days2018: Moderate 134 of 365 days2018: Unhealthy for Sensitive Groups 5 of 365 days2019: Good 230 of 365 days2019: Moderate 129 of 365 days2019: Unhealthy for Sensitive Groups 5 of 365 days2019: Unhealthy 1 of 365 days2020: Good 227 of 362 days2020: Moderate 134 of 362 days2020: Unhealthy for Sensitive Groups 1 of 362 days20202021: Good 198 of 365 days2021: Moderate 162 of 365 days2021: Unhealthy for Sensitive Groups 5 of 365 days2022: Good 240 of 365 days2022: Moderate 123 of 365 days2022: Unhealthy for Sensitive Groups 2 of 365 days2023: Good 205 of 364 days2023: Moderate 147 of 364 days2023: Unhealthy for Sensitive Groups 7 of 364 days2023: Unhealthy 3 of 364 days2023: Very Unhealthy 2 of 364 days2024: Good 254 of 366 days2024: Moderate 110 of 366 days2024: Unhealthy for Sensitive Groups 2 of 366 days2025: Good 249 of 365 days2025: Moderate 113 of 365 days2025: Unhealthy for Sensitive Groups 3 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 year0501001502001980: 90th percentile AQI 1721981: 90th percentile AQI 1151982: 90th percentile AQI 1191983: 90th percentile AQI 1361984: 90th percentile AQI 971985: 90th percentile AQI 1051986: 90th percentile AQI 911987: 90th percentile AQI 1011988: 90th percentile AQI 1431989: 90th percentile AQI 971990: 90th percentile AQI 931991: 90th percentile AQI 1151992: 90th percentile AQI 671993: 90th percentile AQI 1001994: 90th percentile AQI 871995: 90th percentile AQI 931996: 90th percentile AQI 821997: 90th percentile AQI 841998: 90th percentile AQI 1151999: 90th percentile AQI 1082000: 90th percentile AQI 802001: 90th percentile AQI 1052002: 90th percentile AQI 1102003: 90th percentile AQI 832004: 90th percentile AQI 772005: 90th percentile AQI 872006: 90th percentile AQI 872007: 90th percentile AQI 972008: 90th percentile AQI 792009: 90th percentile AQI 762010: 90th percentile AQI 872011: 90th percentile AQI 802012: 90th percentile AQI 842013: 90th percentile AQI 792014: 90th percentile AQI 762015: 90th percentile AQI 802016: 90th percentile AQI 712017: 90th percentile AQI 702018: 90th percentile AQI 702019: 90th percentile AQI 672020: 90th percentile AQI 632021: 90th percentile AQI 712022: 90th percentile AQI 642023: 90th percentile AQI 722024: 90th percentile AQI 622025: 90th percentile AQI 651980: Median AQI 471981: Median AQI 431982: Median AQI 451983: Median AQI 441984: Median AQI 441985: Median AQI 441986: Median AQI 441987: Median AQI 451988: Median AQI 431989: Median AQI 411990: Median AQI 411991: Median AQI 421992: Median AQI 371993: Median AQI 401994: Median AQI 421995: Median AQI 401996: Median AQI 411997: Median AQI 401998: Median AQI 401999: Median AQI 452000: Median AQI 422001: Median AQI 472002: Median AQI 442003: Median AQI 402004: Median AQI 402005: Median AQI 442006: Median AQI 432007: Median AQI 452008: Median AQI 412009: Median AQI 522010: Median AQI 502011: Median AQI 552012: Median AQI 572013: Median AQI 542014: Median AQI 532015: Median AQI 542016: Median AQI 542017: Median AQI 492018: Median AQI 442019: Median AQI 442020: Median AQI 442021: Median AQI 482022: Median AQI 442023: Median AQI 482024: Median AQI 432025: Median AQI 431980198519901995200020052010201520202025
  • 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
Ozone23264%
Fine particles (PM2.5)13336%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202536524911330004365122Ozone
202436625411020004362105Ozone
202336420514773204872287PM2.5
202236524012320004464101PM2.5
202136519816250004871133PM2.5
202036222713410004463102PM2.5
201936523012951004467170PM2.5
201836522613450004470117PM2.5
201736518417650004970122PM2.5
201636613622370005471129PM2.5
201536514821160005480119PM2.5
201436515520280005376127PM2.5
2013365132221120005479141PM2.5
2012366115238130005784147PM2.5
2011365134220110005580143PM2.5
2010365190149233005087154PM2.5
200936517618270005276140PM2.5
2008366239106201004179156Ozone
200727315499191004597161Ozone
200631320196142004387158Ozone
2005365227115203004487169NO2
200436625210491004077151NO2
200336524899161104083201NO2
200236521810229160044110197Ozone
20013652061193271047105201Ozone
2000366231118143004280197NO2
199936521710527142045108215Ozone
19983652626026170040115190NO2
199736528751188104084213NO2
199636627662235004182200NO2
199536527360219204093209NO2
199436526972212104287207NO2
19933652706124100040100190NO2
199236630547104003767174NO2
19913652516827163042115206Ozone
1990365256791713004193192NO2
1989365258732311004197179NO2
198836624065291616043143233NO2
19873652359222142045101213NO2
198636525482209004491185NO2
19853652319526130044105192Ozone
198436624786229204497202NO2
19833652397230159044136214NO2
198236521910125164045119216NO2
19813582317628176043115240NO2
198036121176242921047172252NO2

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