EnviroNearby

Anne Arundel County, Maryland air quality history

Daily Air Quality Index summaries from EPA monitors in Anne Arundel, Maryland, 1980–2025.

88%
Good days in 2025
40
Median daily AQI, 2025
2
Days above 100 in 2025
259
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Anne Arundel, Maryland on 259 days. 227 of those days (88%) 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 238 days. Across the years with fuller monitoring, the share of Good days rose: an average of 59% in 1980–1982 versus 85% in 2023–2025.

EPA did not report an AQI for every day of 2025 here (259 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.

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 215 of 342 days1980: Moderate 53 of 342 days1980: Unhealthy for Sensitive Groups 29 of 342 days1980: Unhealthy 26 of 342 days1980: Very Unhealthy 19 of 342 days19801981: Good 204 of 362 days1981: Moderate 90 of 362 days1981: Unhealthy for Sensitive Groups 37 of 362 days1981: Unhealthy 23 of 362 days1981: Very Unhealthy 8 of 362 days1982: Good 209 of 360 days1982: Moderate 78 of 360 days1982: Unhealthy for Sensitive Groups 48 of 360 days1982: Unhealthy 23 of 360 days1982: Very Unhealthy 2 of 360 days1983: Good 216 of 348 days1983: Moderate 61 of 348 days1983: Unhealthy for Sensitive Groups 26 of 348 days1983: Unhealthy 25 of 348 days1983: Very Unhealthy 20 of 348 days1984: Good 246 of 365 days1984: Moderate 60 of 365 days1984: Unhealthy for Sensitive Groups 30 of 365 days1984: Unhealthy 21 of 365 days1984: Very Unhealthy 8 of 365 days1985: Good 218 of 365 days1985: Moderate 63 of 365 days1985: Unhealthy for Sensitive Groups 57 of 365 days1985: Unhealthy 20 of 365 days1985: Very Unhealthy 7 of 365 days19851986: Good 222 of 364 days1986: Moderate 79 of 364 days1986: Unhealthy for Sensitive Groups 35 of 364 days1986: Unhealthy 24 of 364 days1986: Very Unhealthy 4 of 364 days1987: Good 218 of 365 days1987: Moderate 65 of 365 days1987: Unhealthy for Sensitive Groups 42 of 365 days1987: Unhealthy 20 of 365 days1987: Very Unhealthy 20 of 365 days1988: Good 235 of 366 days1988: Moderate 51 of 366 days1988: Unhealthy for Sensitive Groups 33 of 366 days1988: Unhealthy 22 of 366 days1988: Very Unhealthy 25 of 366 days1989: Good 243 of 365 days1989: Moderate 75 of 365 days1989: Unhealthy for Sensitive Groups 36 of 365 days1989: Unhealthy 10 of 365 days1989: Very Unhealthy 1 of 365 days1990: Good 249 of 363 days1990: Moderate 55 of 363 days1990: Unhealthy for Sensitive Groups 42 of 363 days1990: Unhealthy 16 of 363 days1990: Very Unhealthy 1 of 363 days19901991: Good 158 of 294 days1991: Moderate 53 of 294 days1991: Unhealthy for Sensitive Groups 43 of 294 days1991: Unhealthy 29 of 294 days1991: Very Unhealthy 11 of 294 days1992: Good 143 of 241 days1992: Moderate 56 of 241 days1992: Unhealthy for Sensitive Groups 27 of 241 days1992: Unhealthy 15 of 241 days1993: Good 111 of 239 days1993: Moderate 43 of 239 days1993: Unhealthy for Sensitive Groups 54 of 239 days1993: Unhealthy 22 of 239 days1993: Very Unhealthy 9 of 239 days1994: Good 170 of 284 days1994: Moderate 55 of 284 days1994: Unhealthy for Sensitive Groups 33 of 284 days1994: Unhealthy 23 of 284 days1994: Very Unhealthy 3 of 284 days1995: Good 239 of 364 days1995: Moderate 60 of 364 days1995: Unhealthy for Sensitive Groups 36 of 364 days1995: Unhealthy 22 of 364 days1995: Very Unhealthy 7 of 364 days19951996: Good 256 of 364 days1996: Moderate 54 of 364 days1996: Unhealthy for Sensitive Groups 39 of 364 days1996: Unhealthy 14 of 364 days1996: Very Unhealthy 1 of 364 days1997: Good 189 of 299 days1997: Moderate 47 of 299 days1997: Unhealthy for Sensitive Groups 35 of 299 days1997: Unhealthy 18 of 299 days1997: Very Unhealthy 10 of 299 days1998: Good 103 of 240 days1998: Moderate 57 of 240 days1998: Unhealthy for Sensitive Groups 36 of 240 days1998: Unhealthy 35 of 240 days1998: Very Unhealthy 9 of 240 days1999: Good 101 of 247 days1999: Moderate 83 of 247 days1999: Unhealthy for Sensitive Groups 29 of 247 days1999: Unhealthy 29 of 247 days1999: Very Unhealthy 5 of 247 days2000: Good 150 of 304 days2000: Moderate 121 of 304 days2000: Unhealthy for Sensitive Groups 23 of 304 days2000: Unhealthy 8 of 304 days2000: Very Unhealthy 2 of 304 days20002001: Good 195 of 362 days2001: Moderate 124 of 362 days2001: Unhealthy for Sensitive Groups 22 of 362 days2001: Unhealthy 18 of 362 days2001: Very Unhealthy 3 of 362 days2002: Good 174 of 363 days2002: Moderate 121 of 363 days2002: Unhealthy for Sensitive Groups 34 of 363 days2002: Unhealthy 24 of 363 days2002: Very Unhealthy 10 of 363 days2003: Good 203 of 350 days2003: Moderate 119 of 350 days2003: Unhealthy for Sensitive Groups 23 of 350 days2003: Unhealthy 3 of 350 days2003: Very Unhealthy 2 of 350 days2004: Good 135 of 285 days2004: Moderate 121 of 285 days2004: Unhealthy for Sensitive Groups 24 of 285 days2004: Unhealthy 4 of 285 days2004: Very Unhealthy 1 of 285 days2005: Good 199 of 338 days2005: Moderate 111 of 338 days2005: Unhealthy for Sensitive Groups 20 of 338 days2005: Unhealthy 8 of 338 days20052006: Good 110 of 263 days2006: Moderate 122 of 263 days2006: Unhealthy for Sensitive Groups 25 of 263 days2006: Unhealthy 6 of 263 days2007: Good 101 of 259 days2007: Moderate 124 of 259 days2007: Unhealthy for Sensitive Groups 29 of 259 days2007: Unhealthy 4 of 259 days2007: Very Unhealthy 1 of 259 days2008: Good 129 of 260 days2008: Moderate 109 of 260 days2008: Unhealthy for Sensitive Groups 19 of 260 days2008: Unhealthy 3 of 260 days2009: Good 140 of 344 days2009: Moderate 201 of 344 days2009: Unhealthy for Sensitive Groups 3 of 344 days2010: Good 158 of 360 days2010: Moderate 182 of 360 days2010: Unhealthy for Sensitive Groups 16 of 360 days2010: Unhealthy 4 of 360 days20102011: Good 151 of 264 days2011: Moderate 96 of 264 days2011: Unhealthy for Sensitive Groups 13 of 264 days2011: Unhealthy 4 of 264 days2012: Good 146 of 262 days2012: Moderate 99 of 262 days2012: Unhealthy for Sensitive Groups 11 of 262 days2012: Unhealthy 6 of 262 days2013: Good 168 of 258 days2013: Moderate 86 of 258 days2013: Unhealthy for Sensitive Groups 4 of 258 days2014: Good 186 of 264 days2014: Moderate 77 of 264 days2014: Unhealthy for Sensitive Groups 1 of 264 days2015: Good 177 of 264 days2015: Moderate 83 of 264 days2015: Unhealthy for Sensitive Groups 4 of 264 days20152016: Good 166 of 267 days2016: Moderate 93 of 267 days2016: Unhealthy for Sensitive Groups 8 of 267 days2017: Good 216 of 265 days2017: Moderate 43 of 265 days2017: Unhealthy for Sensitive Groups 6 of 265 days2018: Good 193 of 261 days2018: Moderate 59 of 261 days2018: Unhealthy for Sensitive Groups 9 of 261 days2019: Good 179 of 264 days2019: Moderate 78 of 264 days2019: Unhealthy for Sensitive Groups 7 of 264 days2020: Good 235 of 262 days2020: Moderate 25 of 262 days2020: Unhealthy for Sensitive Groups 2 of 262 days20202021: Good 222 of 262 days2021: Moderate 39 of 262 days2021: Unhealthy for Sensitive Groups 1 of 262 days2022: Good 247 of 263 days2022: Moderate 16 of 263 days2023: Good 225 of 263 days2023: Moderate 36 of 263 days2023: Unhealthy for Sensitive Groups 2 of 263 days2024: Good 186 of 231 days2024: Moderate 44 of 231 days2024: Unhealthy for Sensitive Groups 1 of 231 days2025: Good 227 of 259 days2025: Moderate 30 of 259 days2025: Unhealthy for Sensitive Groups 2 of 259 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 1331983: 90th percentile AQI 1721984: 90th percentile AQI 1331985: 90th percentile AQI 1401986: 90th percentile AQI 1361987: 90th percentile AQI 1591988: 90th percentile AQI 1741989: 90th percentile AQI 1121990: 90th percentile AQI 1261991: 90th percentile AQI 1641992: 90th percentile AQI 1221993: 90th percentile AQI 1561994: 90th percentile AQI 1501995: 90th percentile AQI 1331996: 90th percentile AQI 1221997: 90th percentile AQI 1471998: 90th percentile AQI 1791999: 90th percentile AQI 1642000: 90th percentile AQI 1052001: 90th percentile AQI 1082002: 90th percentile AQI 1402003: 90th percentile AQI 972004: 90th percentile AQI 1012005: 90th percentile AQI 972006: 90th percentile AQI 1052007: 90th percentile AQI 1052008: 90th percentile AQI 972009: 90th percentile AQI 722010: 90th percentile AQI 902011: 90th percentile AQI 872012: 90th percentile AQI 902013: 90th percentile AQI 712014: 90th percentile AQI 672015: 90th percentile AQI 672016: 90th percentile AQI 772017: 90th percentile AQI 642018: 90th percentile AQI 772019: 90th percentile AQI 772020: 90th percentile AQI 512021: 90th percentile AQI 642022: 90th percentile AQI 482023: 90th percentile AQI 582024: 90th percentile AQI 672025: 90th percentile AQI 581980: Median AQI 431981: Median AQI 471982: Median AQI 461983: Median AQI 421984: Median AQI 411985: Median AQI 451986: Median AQI 441987: Median AQI 451988: Median AQI 431989: Median AQI 411990: Median AQI 381991: Median AQI 471992: Median AQI 451993: Median AQI 541994: Median AQI 451995: Median AQI 371996: Median AQI 371997: Median AQI 441998: Median AQI 671999: Median AQI 582000: Median AQI 512001: Median AQI 482002: Median AQI 522003: Median AQI 452004: Median AQI 522005: Median AQI 442006: Median AQI 542007: Median AQI 562008: Median AQI 512009: Median AQI 542010: Median AQI 532011: Median AQI 472012: Median AQI 492013: Median AQI 452014: Median AQI 442015: Median AQI 452016: Median AQI 442017: Median AQI 412018: Median AQI 422019: Median AQI 452020: Median AQI 392021: Median AQI 382022: Median AQI 382023: Median AQI 402024: Median AQI 402025: 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
Ozone23892%
Coarse particles (PM10)218%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20252592273020004058119Ozone
20242311864410004067129Ozone
20232632253620004058150Ozone
2022263247160000384893Ozone
20212622223910003864101Ozone
20202622352520003951108Ozone
20192641797870004577143Ozone
20182611935990004277140Ozone
20172652164360004164129Ozone
20162671669380004477140Ozone
20152641778340004567119Ozone
20142641867710004467133Ozone
20132581688640004571119Ozone
201226214699116004990192Ozone
201126415196134004787172Ozone
2010360158182164005390185PM2.5
200934414020130005472115PM2.5
2008260129109193005197154Ozone
20072591011242941056105214Ozone
20062631101222560054105200Ozone
2005338199111208004497172Ozone
20042851351212441052101202Ozone
2003350203119233204597218Ozone
2002363174121342410052140215Ozone
200136219512422183048108206Ozone
20003041501212382051105215Ozone
19992471018329295058164220Ozone
19982401035736359067179218Ozone
199729918947351810044147245Ozone
19963642565439141037122204Ozone
19953642396036227037133244Ozone
19942841705533233045150222Ozone
19932391114354229054156213Ozone
19922411435627150045122195Ozone
199129415853432911047164241Ozone
19903632495542161038126215Ozone
19893652437536101041112207Ozone
198836623551332225043174238Ozone
198736521865422020045159219Ozone
19863642227935244044136208Ozone
19853652186357207045140210Ozone
19843652466030218041133223Ozone
198334821661262520042172255Ozone
19823602097848232046133202Ozone
19813622049037238047136253NO2
198034221553292619043156224Ozone

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