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AirHistory

What Is the Air Quality in Gilmer, West Virginia?

Gilmer, West Virginia has an Air Quality Grade of B (good) with a 5-year median AQI of 32. The dominant pollutant is Ground-Level Ozone, and air quality has been worsening over the past decade.

Gilmer, West Virginia Air Quality Snapshot

Air Quality GradeB67/100
5-Year Median AQI32 (Good)
Most Recent Median AQI (2022)37 (Good)
Dominant PollutantGround-Level Ozone
10-Year TrendWorsening (+0.32 AQI/yr)
Unhealthy Days (last 5 yr)0
National Rank (cleanest = #1)#157 of 1,020 (15th cleanest percentile)
West Virginia Rank#2 of 14

What Does the B Grade Mean?

Gilmer, West Virginia earns a B — air quality is reliably in the safe range for most residents most of the time, with a 5-year median AQI of 32. Sensitive groups will see occasional caution days, but the typical resident will not need to change behavior based on air quality.

Gilmer, West Virginia's 5-year median AQI of 32 is 9 points below the national average of 41 — meaningfully cleaner than the typical U.S. metro tracked here. Within West Virginia, Gilmer, West Virginia runs cleaner than the state average of 37 — a positive signal that local conditions (terrain, wind patterns, emission sources) are working in residents' favor.

For context within West Virginia: Marion, West Virginia currently holds the state's cleanest grade (B, AQI 38), while Kanawha, West Virginia sits at the bottom (C, AQI 42).

What's in Gilmer, West Virginia's Air?

The dominant pollutant in Gilmer, West Virginia is Ground-Level Ozone. Ground-level ozone forms when sunlight reacts with vehicle exhaust and industrial emissions. It is worst on hot, sunny, stagnant summer days. Ozone irritates the lungs, triggers asthma attacks, and reduces lung function — even healthy adults can feel chest tightness and shortness of breath after exercising in elevated ozone.

Days by Dominant Pollutant (2022)

PollutantDays as DominantShare of Year
Ground-Level Ozone110100%

Is the Air Getting Better or Worse?

Air quality in Gilmer, West Virginia has been getting worse over the past decade, with median AQI climbing by roughly 0.3 points per year. That bucks the national trend of broad improvement, and most often reflects either growing wildfire smoke exposure (particularly across the West) or rising local emissions from population and freight growth.

In 2014, Gilmer, West Virginia posted a median AQI of 31. By 2022 that figure was 37 — a rise of 6 AQI points dirtier across 9 years of EPA records.

Year-by-Year AQI in Gilmer, West Virginia

YearMedian AQIGood DaysUnhealthy DaysDominant Pollutant
2014313480Ozone
2015313380Ozone
2016323341Ozone
2017313510Ozone
2018293460Ozone
2019323330Ozone
2020293630Ozone
2021313500Ozone
2022371080Ozone

Health Context for Gilmer, West Virginia

Across the past five years, this area has logged just 0 days where AQI rose into the "Unhealthy for Sensitive Groups" range or worse — about 0 days per year, or roughly one every other month. That is a low count by national standards.

For most healthy adults, current air quality in this area does not require any change in behavior. People with severe asthma, COPD, or recent cardiac events should still keep an eye on daily AQI alerts, especially during wildfire season. Because ozone peaks in the afternoon on hot sunny days, plan outdoor exercise for early morning or after sunset on bad-air days.

How This Grade Is Calculated

The AirHistory Air Quality Grade combines four signals: the 5-year median AQI (40% of the score), the 10-year trend direction (30%), the count of unhealthy days per year (20%), and the dominant pollutant type (10%). All four come directly from the EPA Air Quality System (AQS), which aggregates readings from federally certified monitors. Read the full methodology.

Gilmer, West Virginia has an Air Quality Grade of B (good) with a 5-year median AQI of 32. The dominant pollutant is Ground-Level Ozone, and air quality has been worsening over the past decade.

This answer pulls from the EPA Air Quality System (AQS), the authoritative federal source for U.S. air quality and pollution monitoring. The headline number above is the direct answer; what follows is the additional context most readers need to use the answer for a real decision rather than just a fact lookup.

A practical caveat: the headline answer above reflects the most recent the EPA Air Quality System (AQS) vintage; underlying data is often revised for months after first publication, and the right reference for any specific decision is whichever vintage is current at the time of the decision. The as-of date is stamped on every page.

Source: EPA Outdoor Air Quality Data, 2026.