EnviroNearby

Chesterfield County, Virginia air quality history

Daily Air Quality Index summaries from EPA monitors in Chesterfield, Virginia, 1980–2025.

81%
Good days in 2025
39
Median daily AQI, 2025
0
Days above 100 in 2025
364
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Chesterfield, Virginia on 364 days. 294 of those days (81%) were in the Good range, and the median daily AQI was 39. That median is about the same as the typical monitored county in Virginia (median 37 across 25 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 226 days. Across the years with fuller monitoring, the share of Good days rose: an average of 36% in 1980–1982 versus 81% 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 37 of 156 days1980: Moderate 70 of 156 days1980: Unhealthy for Sensitive Groups 39 of 156 days1980: Unhealthy 9 of 156 days1980: Very Unhealthy 1 of 156 days19801981: Good 77 of 163 days1981: Moderate 54 of 163 days1981: Unhealthy for Sensitive Groups 23 of 163 days1981: Unhealthy 7 of 163 days1981: Very Unhealthy 2 of 163 days1982: Good 57 of 151 days1982: Moderate 63 of 151 days1982: Unhealthy for Sensitive Groups 26 of 151 days1982: Unhealthy 5 of 151 days1983: Good 43 of 162 days1983: Moderate 56 of 162 days1983: Unhealthy for Sensitive Groups 34 of 162 days1983: Unhealthy 25 of 162 days1983: Very Unhealthy 4 of 162 days1984: Good 95 of 182 days1984: Moderate 65 of 182 days1984: Unhealthy for Sensitive Groups 15 of 182 days1984: Unhealthy 7 of 182 days1985: Good 67 of 176 days1985: Moderate 71 of 176 days1985: Unhealthy for Sensitive Groups 27 of 176 days1985: Unhealthy 9 of 176 days1985: Very Unhealthy 2 of 176 days19851986: Good 123 of 204 days1986: Moderate 65 of 204 days1986: Unhealthy for Sensitive Groups 16 of 204 days1987: Good 92 of 206 days1987: Moderate 66 of 206 days1987: Unhealthy for Sensitive Groups 40 of 206 days1987: Unhealthy 6 of 206 days1987: Very Unhealthy 2 of 206 days1988: Good 105 of 206 days1988: Moderate 63 of 206 days1988: Unhealthy for Sensitive Groups 14 of 206 days1988: Unhealthy 19 of 206 days1988: Very Unhealthy 5 of 206 days1989: Good 132 of 221 days1989: Moderate 70 of 221 days1989: Unhealthy for Sensitive Groups 16 of 221 days1989: Unhealthy 3 of 221 days1990: Good 161 of 208 days1990: Moderate 37 of 208 days1990: Unhealthy for Sensitive Groups 9 of 208 days1990: Unhealthy 1 of 208 days19901991: Good 166 of 231 days1991: Moderate 56 of 231 days1991: Unhealthy for Sensitive Groups 8 of 231 days1991: Unhealthy 1 of 231 days1992: Good 159 of 238 days1992: Moderate 64 of 238 days1992: Unhealthy for Sensitive Groups 13 of 238 days1992: Unhealthy 2 of 238 days1993: Good 114 of 238 days1993: Moderate 77 of 238 days1993: Unhealthy for Sensitive Groups 37 of 238 days1993: Unhealthy 8 of 238 days1993: Very Unhealthy 2 of 238 days1994: Good 149 of 238 days1994: Moderate 57 of 238 days1994: Unhealthy for Sensitive Groups 30 of 238 days1994: Unhealthy 2 of 238 days1995: Good 152 of 233 days1995: Moderate 58 of 233 days1995: Unhealthy for Sensitive Groups 17 of 233 days1995: Unhealthy 6 of 233 days19951996: Good 142 of 223 days1996: Moderate 60 of 223 days1996: Unhealthy for Sensitive Groups 19 of 223 days1996: Unhealthy 2 of 223 days1997: Good 130 of 237 days1997: Moderate 68 of 237 days1997: Unhealthy for Sensitive Groups 31 of 237 days1997: Unhealthy 8 of 237 days1998: Good 114 of 226 days1998: Moderate 67 of 226 days1998: Unhealthy for Sensitive Groups 39 of 226 days1998: Unhealthy 5 of 226 days1998: Very Unhealthy 1 of 226 days1999: Good 119 of 232 days1999: Moderate 76 of 232 days1999: Unhealthy for Sensitive Groups 28 of 232 days1999: Unhealthy 9 of 232 days2000: Good 112 of 259 days2000: Moderate 124 of 259 days2000: Unhealthy for Sensitive Groups 22 of 259 days2000: Unhealthy 1 of 259 days20002001: Good 117 of 253 days2001: Moderate 116 of 253 days2001: Unhealthy for Sensitive Groups 16 of 253 days2001: Unhealthy 4 of 253 days2002: Good 107 of 258 days2002: Moderate 114 of 258 days2002: Unhealthy for Sensitive Groups 28 of 258 days2002: Unhealthy 8 of 258 days2002: Very Unhealthy 1 of 258 days2003: Good 133 of 253 days2003: Moderate 105 of 253 days2003: Unhealthy for Sensitive Groups 13 of 253 days2003: Unhealthy 2 of 253 days2004: Good 149 of 263 days2004: Moderate 106 of 263 days2004: Unhealthy for Sensitive Groups 8 of 263 days2005: Good 117 of 261 days2005: Moderate 125 of 261 days2005: Unhealthy for Sensitive Groups 18 of 261 days2005: Unhealthy 1 of 261 days20052006: Good 128 of 260 days2006: Moderate 124 of 260 days2006: Unhealthy for Sensitive Groups 6 of 260 days2006: Unhealthy 2 of 260 days2007: Good 132 of 262 days2007: Moderate 118 of 262 days2007: Unhealthy for Sensitive Groups 11 of 262 days2007: Unhealthy 1 of 262 days2008: Good 140 of 264 days2008: Moderate 114 of 264 days2008: Unhealthy for Sensitive Groups 7 of 264 days2008: Unhealthy 3 of 264 days2009: Good 178 of 259 days2009: Moderate 81 of 259 days2010: Good 149 of 258 days2010: Moderate 102 of 258 days2010: Unhealthy for Sensitive Groups 4 of 258 days2010: Unhealthy 3 of 258 days20102011: Good 167 of 254 days2011: Moderate 82 of 254 days2011: Unhealthy for Sensitive Groups 5 of 254 days2012: Good 182 of 259 days2012: Moderate 71 of 259 days2012: Unhealthy for Sensitive Groups 6 of 259 days2013: Good 207 of 260 days2013: Moderate 53 of 260 days2014: Good 187 of 241 days2014: Moderate 54 of 241 days2015: Good 186 of 247 days2015: Moderate 61 of 247 days20152016: Good 212 of 265 days2016: Moderate 52 of 265 days2016: Unhealthy for Sensitive Groups 1 of 265 days2017: Good 236 of 278 days2017: Moderate 42 of 278 days2018: Good 238 of 275 days2018: Moderate 37 of 275 days2019: Good 235 of 280 days2019: Moderate 45 of 280 days2020: Good 265 of 279 days2020: Moderate 14 of 279 days20202021: Good 243 of 283 days2021: Moderate 39 of 283 days2021: Unhealthy for Sensitive Groups 1 of 283 days2022: Good 264 of 286 days2022: Moderate 22 of 286 days2023: Good 242 of 278 days2023: Moderate 35 of 278 days2023: Unhealthy for Sensitive Groups 1 of 278 days2024: Good 273 of 361 days2024: Moderate 88 of 361 days2025: Good 294 of 364 days2025: Moderate 70 of 364 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 1361981: 90th percentile AQI 1261982: 90th percentile AQI 1221983: 90th percentile AQI 1641984: 90th percentile AQI 1151985: 90th percentile AQI 1361986: 90th percentile AQI 971987: 90th percentile AQI 1291988: 90th percentile AQI 1611989: 90th percentile AQI 971990: 90th percentile AQI 771991: 90th percentile AQI 841992: 90th percentile AQI 901993: 90th percentile AQI 1221994: 90th percentile AQI 1081995: 90th percentile AQI 1001996: 90th percentile AQI 971997: 90th percentile AQI 1291998: 90th percentile AQI 1221999: 90th percentile AQI 1192000: 90th percentile AQI 1002001: 90th percentile AQI 932002: 90th percentile AQI 1192003: 90th percentile AQI 872004: 90th percentile AQI 762005: 90th percentile AQI 902006: 90th percentile AQI 802007: 90th percentile AQI 872008: 90th percentile AQI 772009: 90th percentile AQI 622010: 90th percentile AQI 792011: 90th percentile AQI 642012: 90th percentile AQI 642013: 90th percentile AQI 592014: 90th percentile AQI 592015: 90th percentile AQI 612016: 90th percentile AQI 562017: 90th percentile AQI 542018: 90th percentile AQI 532019: 90th percentile AQI 542020: 90th percentile AQI 462021: 90th percentile AQI 522022: 90th percentile AQI 482023: 90th percentile AQI 542024: 90th percentile AQI 572025: 90th percentile AQI 551980: Median AQI 801981: Median AQI 511982: Median AQI 611983: Median AQI 871984: Median AQI 501985: Median AQI 641986: Median AQI 461987: Median AQI 581988: Median AQI 501989: Median AQI 441990: Median AQI 411991: Median AQI 421992: Median AQI 441993: Median AQI 511994: Median AQI 451995: Median AQI 451996: Median AQI 441997: Median AQI 501998: Median AQI 501999: Median AQI 502000: Median AQI 542001: Median AQI 522002: Median AQI 542003: Median AQI 492004: Median AQI 482005: Median AQI 542006: Median AQI 512007: Median AQI 502008: Median AQI 482009: Median AQI 432010: Median AQI 482011: Median AQI 442012: Median AQI 442013: Median AQI 392014: Median AQI 412015: Median AQI 412016: Median AQI 392017: Median AQI 402018: Median AQI 362019: Median AQI 402020: Median AQI 342021: Median AQI 382022: Median AQI 382023: Median AQI 412024: Median AQI 412025: Median AQI 391980198519901995200020052010201520202025
  • 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
Fine particles (PM2.5)22662%
Ozone13838%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025364294700000395580PM2.5
2024361273880000415777PM2.5
20232782423510004154139Ozone
2022286264220000384880Ozone
20212832433910003852101Ozone
2020279265140000344661Ozone
2019280235450000405487Ozone
2018275238370000365377Ozone
2017278236420000405477Ozone
20162652125210003956115Ozone
20152471866100004161100Ozone
2014241187540000415990Ozone
2013260207530000395987Ozone
20122591827160004464133Ozone
20112541678250004464126Ozone
201025814910243004879182Ozone
20092591788100004362100Ozone
200826414011473004877185Ozone
2007262132118111005087172Ozone
200626012812462005180164Ozone
2005261117125181005490200Ozone
200426314910680004876126Ozone
2003253133105132004987197Ozone
20022581071142881054119207Ozone
2001253117116164005293169Ozone
20002591121242210054100159Ozone
1999232119762890050119185Ozone
1998226114673951050122202Ozone
1997237130683180050129172Ozone
199622314260192004497156Ozone
1995233152581760045100192Ozone
1994238149573020045108161Ozone
1993238114773782051122204Ozone
199223815964132004490182Ozone
19912311665681004284156Ozone
19902081613791004177187Ozone
198922113270163004497164Ozone
19882061056314195050161239Ozone
198720692664062058129202Ozone
198620412365160004697143Ozone
198517667712792064136207Ozone
198418295651570050115195Ozone
1983162435634254087164223Ozone
198215157632650061122185Ozone
198116377542372051126208Ozone
198015637703991080136201Ozone

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 Virginia with a similar median AQI in 2025

All monitored counties in Virginia

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