EnviroNearby

Prince George's County, Maryland air quality history

Daily Air Quality Index summaries from EPA monitors in Prince George's, Maryland, 1980–2025.

84%
Good days in 2025
40
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 Prince George's, Maryland on 365 days. 306 of those days (84%) were in the Good range, and the median daily AQI was 40. That median is about the same as the typical monitored county in Maryland (median 39.5 across 16 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 276 days. Across the years with fuller monitoring, the share of Good days rose: an average of 56% in 1980–1982 versus 77% 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 197 of 338 days1980: Moderate 74 of 338 days1980: Unhealthy for Sensitive Groups 29 of 338 days1980: Unhealthy 24 of 338 days1980: Very Unhealthy 14 of 338 days19801981: Good 208 of 360 days1981: Moderate 96 of 360 days1981: Unhealthy for Sensitive Groups 36 of 360 days1981: Unhealthy 13 of 360 days1981: Very Unhealthy 7 of 360 days1982: Good 190 of 357 days1982: Moderate 113 of 357 days1982: Unhealthy for Sensitive Groups 31 of 357 days1982: Unhealthy 21 of 357 days1982: Very Unhealthy 2 of 357 days1983: Good 188 of 350 days1983: Moderate 85 of 350 days1983: Unhealthy for Sensitive Groups 35 of 350 days1983: Unhealthy 26 of 350 days1983: Very Unhealthy 16 of 350 days1984: Good 212 of 366 days1984: Moderate 106 of 366 days1984: Unhealthy for Sensitive Groups 23 of 366 days1984: Unhealthy 21 of 366 days1984: Very Unhealthy 4 of 366 days1985: Good 204 of 365 days1985: Moderate 89 of 365 days1985: Unhealthy for Sensitive Groups 51 of 365 days1985: Unhealthy 19 of 365 days1985: Very Unhealthy 2 of 365 days19851986: Good 199 of 365 days1986: Moderate 107 of 365 days1986: Unhealthy for Sensitive Groups 29 of 365 days1986: Unhealthy 27 of 365 days1986: Very Unhealthy 3 of 365 days1987: Good 206 of 365 days1987: Moderate 87 of 365 days1987: Unhealthy for Sensitive Groups 33 of 365 days1987: Unhealthy 29 of 365 days1987: Very Unhealthy 10 of 365 days1988: Good 225 of 366 days1988: Moderate 77 of 366 days1988: Unhealthy for Sensitive Groups 23 of 366 days1988: Unhealthy 23 of 366 days1988: Very Unhealthy 18 of 366 days1989: Good 241 of 365 days1989: Moderate 79 of 365 days1989: Unhealthy for Sensitive Groups 32 of 365 days1989: Unhealthy 12 of 365 days1989: Very Unhealthy 1 of 365 days1990: Good 221 of 365 days1990: Moderate 86 of 365 days1990: Unhealthy for Sensitive Groups 40 of 365 days1990: Unhealthy 16 of 365 days1990: Very Unhealthy 2 of 365 days19901991: Good 218 of 365 days1991: Moderate 70 of 365 days1991: Unhealthy for Sensitive Groups 41 of 365 days1991: Unhealthy 28 of 365 days1991: Very Unhealthy 8 of 365 days1992: Good 267 of 366 days1992: Moderate 59 of 366 days1992: Unhealthy for Sensitive Groups 30 of 366 days1992: Unhealthy 10 of 366 days1993: Good 225 of 365 days1993: Moderate 64 of 365 days1993: Unhealthy for Sensitive Groups 48 of 365 days1993: Unhealthy 25 of 365 days1993: Very Unhealthy 3 of 365 days1994: Good 239 of 365 days1994: Moderate 74 of 365 days1994: Unhealthy for Sensitive Groups 42 of 365 days1994: Unhealthy 8 of 365 days1994: Very Unhealthy 2 of 365 days1995: Good 252 of 365 days1995: Moderate 58 of 365 days1995: Unhealthy for Sensitive Groups 37 of 365 days1995: Unhealthy 14 of 365 days1995: Very Unhealthy 4 of 365 days19951996: Good 258 of 361 days1996: Moderate 61 of 361 days1996: Unhealthy for Sensitive Groups 32 of 361 days1996: Unhealthy 10 of 361 days1997: Good 244 of 365 days1997: Moderate 64 of 365 days1997: Unhealthy for Sensitive Groups 33 of 365 days1997: Unhealthy 19 of 365 days1997: Very Unhealthy 5 of 365 days1998: Good 237 of 365 days1998: Moderate 59 of 365 days1998: Unhealthy for Sensitive Groups 40 of 365 days1998: Unhealthy 25 of 365 days1998: Very Unhealthy 4 of 365 days1999: Good 224 of 363 days1999: Moderate 82 of 363 days1999: Unhealthy for Sensitive Groups 32 of 363 days1999: Unhealthy 19 of 363 days1999: Very Unhealthy 6 of 363 days2000: Good 218 of 366 days2000: Moderate 113 of 366 days2000: Unhealthy for Sensitive Groups 26 of 366 days2000: Unhealthy 8 of 366 days2000: Very Unhealthy 1 of 366 days20002001: Good 202 of 364 days2001: Moderate 124 of 364 days2001: Unhealthy for Sensitive Groups 18 of 364 days2001: Unhealthy 19 of 364 days2001: Very Unhealthy 1 of 364 days2002: Good 202 of 365 days2002: Moderate 109 of 365 days2002: Unhealthy for Sensitive Groups 27 of 365 days2002: Unhealthy 22 of 365 days2002: Very Unhealthy 5 of 365 days2003: Good 225 of 353 days2003: Moderate 104 of 353 days2003: Unhealthy for Sensitive Groups 20 of 353 days2003: Unhealthy 2 of 353 days2003: Very Unhealthy 2 of 353 days2004: Good 225 of 363 days2004: Moderate 111 of 363 days2004: Unhealthy for Sensitive Groups 22 of 363 days2004: Unhealthy 5 of 363 days2005: Good 211 of 364 days2005: Moderate 113 of 364 days2005: Unhealthy for Sensitive Groups 32 of 364 days2005: Unhealthy 8 of 364 days20052006: Good 205 of 365 days2006: Moderate 120 of 365 days2006: Unhealthy for Sensitive Groups 30 of 365 days2006: Unhealthy 10 of 365 days2007: Good 184 of 365 days2007: Moderate 138 of 365 days2007: Unhealthy for Sensitive Groups 33 of 365 days2007: Unhealthy 9 of 365 days2007: Very Unhealthy 1 of 365 days2008: Good 178 of 366 days2008: Moderate 166 of 366 days2008: Unhealthy for Sensitive Groups 21 of 366 days2008: Unhealthy 1 of 366 days2009: Good 158 of 365 days2009: Moderate 203 of 365 days2009: Unhealthy for Sensitive Groups 4 of 365 days2010: Good 133 of 362 days2010: Moderate 194 of 362 days2010: Unhealthy for Sensitive Groups 29 of 362 days2010: Unhealthy 6 of 362 days20102011: Good 131 of 363 days2011: Moderate 203 of 363 days2011: Unhealthy for Sensitive Groups 22 of 363 days2011: Unhealthy 7 of 363 days2012: Good 142 of 366 days2012: Moderate 201 of 366 days2012: Unhealthy for Sensitive Groups 17 of 366 days2012: Unhealthy 6 of 366 days2013: Good 186 of 365 days2013: Moderate 173 of 365 days2013: Unhealthy for Sensitive Groups 6 of 365 days2014: Good 160 of 365 days2014: Moderate 201 of 365 days2014: Unhealthy for Sensitive Groups 4 of 365 days2015: Good 128 of 365 days2015: Moderate 230 of 365 days2015: Unhealthy for Sensitive Groups 6 of 365 days2015: Unhealthy 1 of 365 days20152016: Good 199 of 366 days2016: Moderate 158 of 366 days2016: Unhealthy for Sensitive Groups 9 of 366 days2017: Good 240 of 365 days2017: Moderate 119 of 365 days2017: Unhealthy for Sensitive Groups 6 of 365 days2018: Good 248 of 365 days2018: Moderate 109 of 365 days2018: Unhealthy for Sensitive Groups 7 of 365 days2018: Unhealthy 1 of 365 days2019: Good 234 of 365 days2019: Moderate 125 of 365 days2019: Unhealthy for Sensitive Groups 6 of 365 days2020: Good 314 of 366 days2020: Moderate 51 of 366 days2020: Unhealthy for Sensitive Groups 1 of 366 days20202021: Good 287 of 365 days2021: Moderate 73 of 365 days2021: Unhealthy for Sensitive Groups 5 of 365 days2022: Good 313 of 365 days2022: Moderate 51 of 365 days2022: Unhealthy for Sensitive Groups 1 of 365 days2023: Good 253 of 365 days2023: Moderate 101 of 365 days2023: Unhealthy for Sensitive Groups 8 of 365 days2023: Unhealthy 3 of 365 days2024: Good 280 of 366 days2024: Moderate 83 of 366 days2024: Unhealthy for Sensitive Groups 3 of 366 days2025: Good 306 of 365 days2025: Moderate 56 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 1611981: 90th percentile AQI 1291982: 90th percentile AQI 1291983: 90th percentile AQI 1661984: 90th percentile AQI 1191985: 90th percentile AQI 1331986: 90th percentile AQI 1361987: 90th percentile AQI 1541988: 90th percentile AQI 1611989: 90th percentile AQI 1121990: 90th percentile AQI 1261991: 90th percentile AQI 1501992: 90th percentile AQI 1051993: 90th percentile AQI 1471994: 90th percentile AQI 1191995: 90th percentile AQI 1151996: 90th percentile AQI 1151997: 90th percentile AQI 1221998: 90th percentile AQI 1361999: 90th percentile AQI 1332000: 90th percentile AQI 972001: 90th percentile AQI 1012002: 90th percentile AQI 1252003: 90th percentile AQI 922004: 90th percentile AQI 872005: 90th percentile AQI 1052006: 90th percentile AQI 1012007: 90th percentile AQI 1052008: 90th percentile AQI 902009: 90th percentile AQI 742010: 90th percentile AQI 1002011: 90th percentile AQI 872012: 90th percentile AQI 902013: 90th percentile AQI 732014: 90th percentile AQI 712015: 90th percentile AQI 752016: 90th percentile AQI 742017: 90th percentile AQI 642018: 90th percentile AQI 712019: 90th percentile AQI 642020: 90th percentile AQI 552021: 90th percentile AQI 642022: 90th percentile AQI 582023: 90th percentile AQI 672024: 90th percentile AQI 632025: 90th percentile AQI 571980: Median AQI 441981: Median AQI 471982: Median AQI 491983: Median AQI 481984: Median AQI 451985: Median AQI 451986: Median AQI 481987: Median AQI 461988: Median AQI 431989: Median AQI 411990: Median AQI 431991: Median AQI 441992: Median AQI 361993: Median AQI 431994: Median AQI 421995: Median AQI 391996: Median AQI 371997: Median AQI 391998: Median AQI 391999: Median AQI 442000: Median AQI 432001: Median AQI 472002: Median AQI 452003: Median AQI 422004: Median AQI 432005: Median AQI 442006: Median AQI 452007: Median AQI 492008: Median AQI 512009: Median AQI 532010: Median AQI 562011: Median AQI 542012: Median AQI 542013: Median AQI 502014: Median AQI 522015: Median AQI 552016: Median AQI 482017: Median AQI 452018: Median AQI 422019: Median AQI 452020: Median AQI 392021: Median AQI 412022: Median AQI 392023: Median AQI 442024: Median AQI 392025: Median AQI 401980198519901995200020052010201520202025
  • 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
Ozone27676%
Fine particles (PM2.5)8423%
Nitrogen dioxide (NO₂)51%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253653065630004057126Ozone
20243662808330003963129Ozone
202336525310183004467192Ozone
20223653135110003958101Ozone
20213652877350004164129Ozone
20203663145110003955105Ozone
201936523412560004564122Ozone
201836524810971004271166Ozone
201736524011960004564133Ozone
201636619915890004874129PM2.5
201536512823061005575156PM2.5
201436516020140005271119PM2.5
201336518617360005073122PM2.5
2012366142201176005490197PM2.5
2011363131203227005487174PM2.5
20103621331942960056100172PM2.5
200936515820340005374126PM2.5
2008366178166211005190179PM2.5
20073651841383391049105205Ozone
200636520512030100045101192Ozone
20053642111133280044105185Ozone
2004363225111225004387187Ozone
2003353225104202204292221Ozone
200236520210927225045125218Ozone
200136420212418191047101206Ozone
2000366218113268104397214Ozone
19993632248232196044133220Ozone
19983652375940254039136206Ozone
19973652446433195039122237Ozone
19963612586132100037115195Ozone
19953652525837144039115225Ozone
1994365239744282042119216Ozone
19933652256448253043147218Ozone
19923662675930100036105195Ozone
19913652187041288044150230Ozone
19903652218640162043126217Ozone
19893652417932121041112210Ozone
198836622577232318043161254Ozone
198736520687332910046154220Ozone
198636519910729273048136205Ozone
19853652048951192045133218Ozone
198436621210623214045119208Ozone
198335018885352616048166229Ozone
198235719011331212049129212Ozone
19813602089636137047129224Ozone
198033819774292414044161253Ozone

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 Maryland with a similar median AQI in 2025

All monitored counties in Maryland

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