EnviroNearby

Greenbrier County, West Virginia air quality history

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

93%
Good days in 2025
37
Median daily AQI, 2025
0
Days above 100 in 2025
244
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Greenbrier, West Virginia on 244 days. 227 of those days (93%) were in the Good range, and the median daily AQI was 37. That median is about the same as the typical monitored county in West Virginia (median 39 across 12 counties), and lower than the typical monitored U.S. county (40). The main pollutant was ozone on 244 days. Across the years with fuller monitoring, the share of Good days rose: an average of 82% in 1984–1986 versus 94% in 2023–2025.

EPA did not report an AQI for every day of 2025 here (244 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.

Years with fewer than 120 monitored days (1980) are shown in the table but left out of comparisons and trend statements.

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 27 of 72 days1980: Moderate 32 of 72 days1980: Unhealthy for Sensitive Groups 13 of 72 days19801984: Good 125 of 140 days1984: Moderate 7 of 140 days1984: Unhealthy for Sensitive Groups 8 of 140 days1985: Good 281 of 331 days1985: Moderate 40 of 331 days1985: Unhealthy for Sensitive Groups 9 of 331 days1985: Unhealthy 1 of 331 days1986: Good 253 of 353 days1986: Moderate 70 of 353 days1986: Unhealthy for Sensitive Groups 24 of 353 days1986: Unhealthy 6 of 353 days1987: Good 241 of 365 days1987: Moderate 90 of 365 days1987: Unhealthy for Sensitive Groups 27 of 365 days1987: Unhealthy 5 of 365 days1987: Very Unhealthy 2 of 365 days1988: Good 229 of 364 days1988: Moderate 74 of 364 days1988: Unhealthy for Sensitive Groups 34 of 364 days1988: Unhealthy 18 of 364 days1988: Very Unhealthy 9 of 364 days19881989: Good 301 of 352 days1989: Moderate 41 of 352 days1989: Unhealthy for Sensitive Groups 7 of 352 days1989: Unhealthy 3 of 352 days1990: Good 231 of 293 days1990: Moderate 50 of 293 days1990: Unhealthy for Sensitive Groups 11 of 293 days1990: Unhealthy 1 of 293 days1991: Good 196 of 308 days1991: Moderate 83 of 308 days1991: Unhealthy for Sensitive Groups 26 of 308 days1991: Unhealthy 2 of 308 days1991: Very Unhealthy 1 of 308 days1992: Good 261 of 340 days1992: Moderate 63 of 340 days1992: Unhealthy for Sensitive Groups 5 of 340 days1992: Unhealthy 11 of 340 days1993: Good 245 of 364 days1993: Moderate 98 of 364 days1993: Unhealthy for Sensitive Groups 19 of 364 days1993: Unhealthy 2 of 364 days19931994: Good 242 of 339 days1994: Moderate 78 of 339 days1994: Unhealthy for Sensitive Groups 15 of 339 days1994: Unhealthy 4 of 339 days1995: Good 243 of 363 days1995: Moderate 91 of 363 days1995: Unhealthy for Sensitive Groups 26 of 363 days1995: Unhealthy 3 of 363 days1996: Good 268 of 357 days1996: Moderate 70 of 357 days1996: Unhealthy for Sensitive Groups 17 of 357 days1996: Unhealthy 2 of 357 days1997: Good 180 of 303 days1997: Moderate 87 of 303 days1997: Unhealthy for Sensitive Groups 33 of 303 days1997: Unhealthy 3 of 303 days1998: Good 40 of 168 days1998: Moderate 92 of 168 days1998: Unhealthy for Sensitive Groups 26 of 168 days1998: Unhealthy 7 of 168 days1998: Very Unhealthy 3 of 168 days19981999: Good 79 of 212 days1999: Moderate 97 of 212 days1999: Unhealthy for Sensitive Groups 34 of 212 days1999: Unhealthy 2 of 212 days2000: Good 119 of 211 days2000: Moderate 70 of 211 days2000: Unhealthy for Sensitive Groups 21 of 211 days2000: Unhealthy 1 of 211 days2001: Good 114 of 213 days2001: Moderate 85 of 213 days2001: Unhealthy for Sensitive Groups 12 of 213 days2001: Unhealthy 2 of 213 days2002: Good 133 of 212 days2002: Moderate 62 of 212 days2002: Unhealthy for Sensitive Groups 16 of 212 days2002: Unhealthy 1 of 212 days2003: Good 143 of 213 days2003: Moderate 62 of 213 days2003: Unhealthy for Sensitive Groups 7 of 213 days2003: Unhealthy 1 of 213 days20032004: Good 174 of 210 days2004: Moderate 35 of 210 days2004: Unhealthy for Sensitive Groups 1 of 210 days2005: Good 160 of 213 days2005: Moderate 50 of 213 days2005: Unhealthy for Sensitive Groups 3 of 213 days2006: Good 148 of 212 days2006: Moderate 61 of 212 days2006: Unhealthy for Sensitive Groups 3 of 212 days2007: Good 117 of 207 days2007: Moderate 84 of 207 days2007: Unhealthy for Sensitive Groups 6 of 207 days2008: Good 159 of 211 days2008: Moderate 50 of 211 days2008: Unhealthy for Sensitive Groups 2 of 211 days20082009: Good 189 of 209 days2009: Moderate 20 of 209 days2010: Good 155 of 211 days2010: Moderate 53 of 211 days2010: Unhealthy for Sensitive Groups 3 of 211 days2011: Good 151 of 208 days2011: Moderate 57 of 208 days2012: Good 160 of 206 days2012: Moderate 44 of 206 days2012: Unhealthy for Sensitive Groups 2 of 206 days2013: Good 192 of 212 days2013: Moderate 20 of 212 days20132014: Good 185 of 211 days2014: Moderate 26 of 211 days2015: Good 202 of 210 days2015: Moderate 8 of 210 days2016: Good 189 of 207 days2016: Moderate 18 of 207 days2017: Good 227 of 239 days2017: Moderate 12 of 239 days2018: Good 222 of 232 days2018: Moderate 10 of 232 days20182019: Good 222 of 242 days2019: Moderate 20 of 242 days2020: Good 232 of 234 days2020: Moderate 2 of 234 days2021: Good 223 of 231 days2021: Moderate 8 of 231 days2022: Good 236 of 240 days2022: Moderate 4 of 240 days2023: Good 227 of 242 days2023: Moderate 15 of 242 days20232024: Good 234 of 243 days2024: Moderate 9 of 243 days2025: Good 227 of 244 days2025: Moderate 17 of 244 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 year0501001501980: 90th percentile AQI 1121984: 90th percentile AQI 581985: 90th percentile AQI 671986: 90th percentile AQI 931987: 90th percentile AQI 1001988: 90th percentile AQI 1261989: 90th percentile AQI 671990: 90th percentile AQI 771991: 90th percentile AQI 1001992: 90th percentile AQI 771993: 90th percentile AQI 901994: 90th percentile AQI 871995: 90th percentile AQI 931996: 90th percentile AQI 841997: 90th percentile AQI 1051998: 90th percentile AQI 1331999: 90th percentile AQI 1152000: 90th percentile AQI 1012001: 90th percentile AQI 932002: 90th percentile AQI 932003: 90th percentile AQI 842004: 90th percentile AQI 612005: 90th percentile AQI 712006: 90th percentile AQI 802007: 90th percentile AQI 872008: 90th percentile AQI 672009: 90th percentile AQI 502010: 90th percentile AQI 712011: 90th percentile AQI 672012: 90th percentile AQI 642013: 90th percentile AQI 502014: 90th percentile AQI 542015: 90th percentile AQI 482016: 90th percentile AQI 492017: 90th percentile AQI 472018: 90th percentile AQI 482019: 90th percentile AQI 502020: 90th percentile AQI 442021: 90th percentile AQI 462022: 90th percentile AQI 442023: 90th percentile AQI 482024: 90th percentile AQI 472025: 90th percentile AQI 491980: Median AQI 671984: Median AQI 261985: Median AQI 331986: Median AQI 391987: Median AQI 411988: Median AQI 431989: Median AQI 331990: Median AQI 401991: Median AQI 451992: Median AQI 391993: Median AQI 441994: Median AQI 401995: Median AQI 371996: Median AQI 341997: Median AQI 451998: Median AQI 741999: Median AQI 612000: Median AQI 482001: Median AQI 492002: Median AQI 452003: Median AQI 452004: Median AQI 412005: Median AQI 442006: Median AQI 452007: Median AQI 492008: Median AQI 442009: Median AQI 392010: Median AQI 442011: Median AQI 462012: Median AQI 442013: Median AQI 412014: Median AQI 412015: Median AQI 382016: Median AQI 392017: Median AQI 392018: Median AQI 382019: Median AQI 422020: Median AQI 342021: Median AQI 372022: Median AQI 342023: Median AQI 382024: Median AQI 402025: Median AQI 371980198819931998200320082013201820232025
  • 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
Ozone244100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025244227170000374977Ozone
202424323490000404764Ozone
2023242227150000384887Ozone
202224023640000344471Ozone
202123122380000374664Ozone
202023423220000344454Ozone
2019242222200000425084Ozone
2018232222100000384884Ozone
2017239227120000394784Ozone
20162071891800003949100Ozone
201521020280000384871Ozone
2014211185260000415493Ozone
2013212192200000415097Ozone
20122061604420004464140Ozone
2011208151570000466797Ozone
20102111555330004471108Ozone
2009209189200000395097Ozone
20082111595020004467112Ozone
20072071178460004987133Ozone
20062121486130004580119Ozone
20052131605030004471129Ozone
20042101743510004161112Ozone
20032131436271004584156Ozone
200221213362161004593164Ozone
200121311485122004993156Ozone
2000211119702110048101154Ozone
199921279973420061115151Ozone
199816840922673074133207Ozone
1997303180873330045105200Ozone
199635726870172003484154Ozone
199536324391263003793172Ozone
199433924278154004087164Ozone
199336424598192004490169Ozone
199234026163511003977187Ozone
1991308196832621045100222Ozone
199029323150111004077154Ozone
19893523014173003367179Ozone
19883642297434189043126210Ozone
1987365241902752041100205Ozone
198635325370246003993172Ozone
19853312814091003367154Ozone
1984140125780002658147Ozone
19807227321300067112133Ozone

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 West Virginia with a similar median AQI in 2025

All monitored counties in West 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