EnviroNearby

Wood County, West Virginia air quality history

Daily Air Quality Index summaries from EPA monitors in Wood, West Virginia, 1983–2025.

83%
Good days in 2025
39
Median daily AQI, 2025
0
Days above 100 in 2025
281
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Wood, West Virginia on 281 days. 233 of those days (83%) were in the Good range, and the median daily AQI was 39. That median is about the same as the typical monitored county in West Virginia (median 39 across 12 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 203 days. Across the years with fuller monitoring, the share of Good days rose: an average of 70% in 1983–1985 versus 80% in 2023–2025.

EPA did not report an AQI for every day of 2025 here (281 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%1983: Good 155 of 253 days1983: Moderate 47 of 253 days1983: Unhealthy for Sensitive Groups 29 of 253 days1983: Unhealthy 19 of 253 days1983: Very Unhealthy 3 of 253 days19831984: Good 257 of 343 days1984: Moderate 54 of 343 days1984: Unhealthy for Sensitive Groups 23 of 343 days1984: Unhealthy 9 of 343 days1985: Good 239 of 325 days1985: Moderate 51 of 325 days1985: Unhealthy for Sensitive Groups 27 of 325 days1985: Unhealthy 8 of 325 days1986: Good 234 of 324 days1986: Moderate 53 of 324 days1986: Unhealthy for Sensitive Groups 23 of 324 days1986: Unhealthy 13 of 324 days1986: Very Unhealthy 1 of 324 days1987: Good 235 of 323 days1987: Moderate 49 of 323 days1987: Unhealthy for Sensitive Groups 24 of 323 days1987: Unhealthy 13 of 323 days1987: Very Unhealthy 2 of 323 days1988: Good 203 of 276 days1988: Moderate 25 of 276 days1988: Unhealthy for Sensitive Groups 16 of 276 days1988: Unhealthy 20 of 276 days1988: Very Unhealthy 12 of 276 days19881989: Good 232 of 303 days1989: Moderate 45 of 303 days1989: Unhealthy for Sensitive Groups 16 of 303 days1989: Unhealthy 9 of 303 days1989: Very Unhealthy 1 of 303 days1990: Good 205 of 275 days1990: Moderate 38 of 275 days1990: Unhealthy for Sensitive Groups 29 of 275 days1990: Unhealthy 3 of 275 days1991: Good 209 of 300 days1991: Moderate 58 of 300 days1991: Unhealthy for Sensitive Groups 19 of 300 days1991: Unhealthy 12 of 300 days1991: Very Unhealthy 2 of 300 days1992: Good 289 of 334 days1992: Moderate 40 of 334 days1992: Unhealthy for Sensitive Groups 5 of 334 days1993: Good 306 of 361 days1993: Moderate 34 of 361 days1993: Unhealthy for Sensitive Groups 18 of 361 days1993: Unhealthy 3 of 361 days19931994: Good 141 of 233 days1994: Moderate 51 of 233 days1994: Unhealthy for Sensitive Groups 27 of 233 days1994: Unhealthy 13 of 233 days1994: Very Unhealthy 1 of 233 days1995: Good 145 of 235 days1995: Moderate 61 of 235 days1995: Unhealthy for Sensitive Groups 18 of 235 days1995: Unhealthy 10 of 235 days1995: Very Unhealthy 1 of 235 days1996: Good 156 of 234 days1996: Moderate 53 of 234 days1996: Unhealthy for Sensitive Groups 20 of 234 days1996: Unhealthy 5 of 234 days1997: Good 166 of 239 days1997: Moderate 48 of 239 days1997: Unhealthy for Sensitive Groups 22 of 239 days1997: Unhealthy 3 of 239 days1998: Good 138 of 240 days1998: Moderate 62 of 240 days1998: Unhealthy for Sensitive Groups 24 of 240 days1998: Unhealthy 16 of 240 days19981999: Good 93 of 255 days1999: Moderate 118 of 255 days1999: Unhealthy for Sensitive Groups 31 of 255 days1999: Unhealthy 12 of 255 days1999: Very Unhealthy 1 of 255 days2000: Good 113 of 262 days2000: Moderate 127 of 262 days2000: Unhealthy for Sensitive Groups 18 of 262 days2000: Unhealthy 4 of 262 days2001: Good 102 of 260 days2001: Moderate 127 of 260 days2001: Unhealthy for Sensitive Groups 29 of 260 days2001: Unhealthy 2 of 260 days2002: Good 107 of 261 days2002: Moderate 110 of 261 days2002: Unhealthy for Sensitive Groups 27 of 261 days2002: Unhealthy 16 of 261 days2002: Very Unhealthy 1 of 261 days2003: Good 121 of 259 days2003: Moderate 128 of 259 days2003: Unhealthy for Sensitive Groups 8 of 259 days2003: Unhealthy 1 of 259 days2003: Very Unhealthy 1 of 259 days20032004: Good 130 of 261 days2004: Moderate 127 of 261 days2004: Unhealthy for Sensitive Groups 4 of 261 days2005: Good 118 of 260 days2005: Moderate 122 of 260 days2005: Unhealthy for Sensitive Groups 17 of 260 days2005: Unhealthy 3 of 260 days2006: Good 122 of 259 days2006: Moderate 122 of 259 days2006: Unhealthy for Sensitive Groups 14 of 259 days2006: Unhealthy 1 of 259 days2007: Good 102 of 260 days2007: Moderate 131 of 260 days2007: Unhealthy for Sensitive Groups 25 of 260 days2007: Unhealthy 2 of 260 days2008: Good 138 of 262 days2008: Moderate 118 of 262 days2008: Unhealthy for Sensitive Groups 6 of 262 days20082009: Good 115 of 353 days2009: Moderate 238 of 353 days2010: Good 129 of 261 days2010: Moderate 125 of 261 days2010: Unhealthy for Sensitive Groups 7 of 261 days2011: Good 159 of 257 days2011: Moderate 96 of 257 days2011: Unhealthy for Sensitive Groups 2 of 257 days2012: Good 142 of 255 days2012: Moderate 107 of 255 days2012: Unhealthy for Sensitive Groups 6 of 255 days2013: Good 189 of 257 days2013: Moderate 66 of 257 days2013: Unhealthy for Sensitive Groups 2 of 257 days20132014: Good 181 of 255 days2014: Moderate 74 of 255 days2015: Good 176 of 260 days2015: Moderate 80 of 260 days2015: Unhealthy for Sensitive Groups 4 of 260 days2016: Good 185 of 265 days2016: Moderate 79 of 265 days2016: Unhealthy for Sensitive Groups 1 of 265 days2017: Good 233 of 283 days2017: Moderate 50 of 283 days2018: Good 243 of 285 days2018: Moderate 42 of 285 days20182019: Good 231 of 277 days2019: Moderate 46 of 277 days2020: Good 250 of 283 days2020: Moderate 33 of 283 days2021: Good 221 of 271 days2021: Moderate 50 of 271 days2022: Good 242 of 281 days2022: Moderate 38 of 281 days2022: Unhealthy for Sensitive Groups 1 of 281 days2023: Good 213 of 269 days2023: Moderate 53 of 269 days2023: Unhealthy for Sensitive Groups 2 of 269 days2023: Unhealthy 1 of 269 days20232024: Good 219 of 280 days2024: Moderate 60 of 280 days2024: Unhealthy for Sensitive Groups 1 of 280 days2025: Good 233 of 281 days2025: Moderate 48 of 281 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 year0501001502001983: 90th percentile AQI 1431984: 90th percentile AQI 1001985: 90th percentile AQI 1011986: 90th percentile AQI 1051987: 90th percentile AQI 1081988: 90th percentile AQI 1591989: 90th percentile AQI 871990: 90th percentile AQI 1081991: 90th percentile AQI 1121992: 90th percentile AQI 611993: 90th percentile AQI 711994: 90th percentile AQI 1291995: 90th percentile AQI 1151996: 90th percentile AQI 1051997: 90th percentile AQI 1011998: 90th percentile AQI 1291999: 90th percentile AQI 1222000: 90th percentile AQI 972001: 90th percentile AQI 1082002: 90th percentile AQI 1222003: 90th percentile AQI 842004: 90th percentile AQI 792005: 90th percentile AQI 972006: 90th percentile AQI 872007: 90th percentile AQI 1012008: 90th percentile AQI 802009: 90th percentile AQI 702010: 90th percentile AQI 802011: 90th percentile AQI 712012: 90th percentile AQI 872013: 90th percentile AQI 602014: 90th percentile AQI 612015: 90th percentile AQI 662016: 90th percentile AQI 632017: 90th percentile AQI 552018: 90th percentile AQI 542019: 90th percentile AQI 562020: 90th percentile AQI 522021: 90th percentile AQI 542022: 90th percentile AQI 522023: 90th percentile AQI 612024: 90th percentile AQI 582025: 90th percentile AQI 541983: Median AQI 451984: Median AQI 331985: Median AQI 401986: Median AQI 341987: Median AQI 331988: Median AQI 291989: Median AQI 341990: Median AQI 371991: Median AQI 401992: Median AQI 321993: Median AQI 321994: Median AQI 451995: Median AQI 441996: Median AQI 441997: Median AQI 431998: Median AQI 461999: Median AQI 582000: Median AQI 562001: Median AQI 572002: Median AQI 542003: Median AQI 522004: Median AQI 512005: Median AQI 542006: Median AQI 522007: Median AQI 582008: Median AQI 502009: Median AQI 542010: Median AQI 512011: Median AQI 442012: Median AQI 472013: Median AQI 432014: Median AQI 432015: Median AQI 442016: Median AQI 432017: Median AQI 402018: Median AQI 372019: Median AQI 402020: Median AQI 372021: Median AQI 382022: Median AQI 392023: Median AQI 412024: Median AQI 432025: Median AQI 391983198819931998200320082013201820232025
  • 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
Ozone20372%
Fine particles (PM2.5)7828%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025281233480000395484Ozone
20242802196010004358101Ozone
20232692135321004161166Ozone
20222812423810003952108Ozone
2021271221500000385476Ozone
2020283250330000375280Ozone
2019277231460000405687Ozone
2018285243420000375477Ozone
2017283233500000405584Ozone
20162651857910004363112Ozone
20152601768040004466129Ozone
20142551817400004361100Ozone
20132571896620004360112Ozone
201225514210760004787147Ozone
20112571599620004471147Ozone
201026112912570005180126Ozone
20093531152380000547095PM2.5
200826213811860005080140Ozone
20072601021312520058101161Ozone
2006259122122141005287154Ozone
2005260118122173005497169Ozone
200426113012740005179121Ozone
200325912112881105284209Ozone
200226110711027161054122213Ozone
20012601021272920057108166Ozone
2000262113127184005697197Ozone
19992559311831121058122209Ozone
19982401386224160046129197Ozone
1997239166482230043101169Ozone
1996234156532050044105197Ozone
19952351456118101044115201Ozone
19942331415127131045129203Ozone
199336130634183003271172Ozone
19923342894050003261129Ozone
19913002095819122040112212Ozone
1990275205382930037108195Ozone
198930323245169103487206Ozone
198827620325162012029159240Ozone
19873232354924132033108228Ozone
19863242345323131034105204Ozone
1985325239512780040101177Ozone
1984343257542390033100190Ozone
19832531554729193045143208Ozone

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 1983–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem