EnviroNearby

Wayne County, West Virginia air quality history

Daily Air Quality Index summaries from EPA monitors in Wayne, West Virginia, 1991–2005.

87%
Good days in 2005
33
Median daily AQI, 2005
0
Days above 100 in 2005
364
Days with an AQI in 2005 (of 365)

In 2005, EPA reported a daily Air Quality Index (AQI) for Wayne, West Virginia on 364 days. 316 of those days (87%) were in the Good range, and the median daily AQI was 33. That median is lower than the typical monitored county in West Virginia (median 46 across 13 counties), and lower than the typical monitored U.S. county (44). The main pollutant was nitrogen dioxide (NO₂) on 364 days. Across the years with fuller monitoring, the share of Good days fell: an average of 99% in 1991–1993 versus 91% in 2003–2005.

The most recent year with data for this county is 2005; EPA's files for 2006–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (1995, 1996, 1997, 1998, 1999) 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%1991: Good 175 of 176 days1991: Moderate 1 of 176 days19911992: Good 355 of 355 days19921993: Good 358 of 362 days1993: Moderate 4 of 362 days19931994: Good 180 of 182 days1994: Moderate 2 of 182 days19941995: Good 55 of 56 days1995: Moderate 1 of 56 days19951996: Good 53 of 53 days19961997: Good 56 of 56 days19971998: Good 56 of 56 days19981999: Good 86 of 92 days1999: Moderate 6 of 92 days19992003: Good 167 of 176 days2003: Moderate 9 of 176 days20032004: Good 326 of 363 days2004: Moderate 37 of 363 days20042005: Good 316 of 364 days2005: Moderate 48 of 364 days2005
  • 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 year0501001991: 90th percentile AQI 291992: 90th percentile AQI 171993: 90th percentile AQI 151994: 90th percentile AQI 291995: 90th percentile AQI 391996: 90th percentile AQI 291997: 90th percentile AQI 301998: 90th percentile AQI 361999: 90th percentile AQI 472003: 90th percentile AQI 482004: 90th percentile AQI 512005: 90th percentile AQI 551991: Median AQI 71992: Median AQI 71993: Median AQI 61994: Median AQI 81995: Median AQI 191996: Median AQI 181997: Median AQI 181998: Median AQI 171999: Median AQI 312003: Median AQI 312004: Median AQI 332005: Median AQI 33199119921993199419951996199719981999200320042005
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2005

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
Nitrogen dioxide (NO₂)364100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2005364316480000335593NO2
2004363326370000335176NO2
200317616790000314866NO2
1999928660000314761NO2
1998565600000173643PM10
1997565600000183045PM10
1996535300000182948PM10
1995565510000193952PM10
19941821802000082954CO
19933623584000061557CO
19923553550000071746CO
19911761751000072952CO

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.

All monitored counties in West Virginia

Source: U.S. EPA AirData, “Annual AQI by County” files for 1991–2005 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem