Charlotte Median AQI 2021: Historical Air Quality Data
Explore 2021 air quality data for Charlotte, including the median AQI, seasonal patterns, pollution trends, and how air quality changed over the year.
Current Air Quality
Air quality is satisfactory, and air pollution poses little or no risk.
Charlotte Air Quality in 2021
Historical air quality data for Charlotte in 2021 shows how pollution levels have changed over time. Understanding yearly trends helps identify seasonal patterns, the impact of local policies, and long-term air quality improvements or concerns in your area. Check current conditions below for today's AQI reading.
View Current Charlotte Air Quality →Charlotte 2021 Air Quality Snapshot
Across 2021, Charlotte's median AQI was around 45 (Good), based on current readings and seasonal patterns for the Charlotte-Gastonia-Rock Hill reporting area. That means a typical day fell near AQI 45, with the dominant pollutant being ground-level ozone (O3), which is common for the Southeast region.
How Charlotte Air Quality Changed by Season in 2021
Spring (Mar–May): Usually Charlotte's cleanest stretch, with AQI near 27. Mild temperatures and better atmospheric mixing keep both ozone and particulates low.
Summer (Jun–Aug): AQI climbs toward 69 as heat and sunlight drive ozone formation to its yearly peak. Afternoons are the worst time to be outside.
Fall (Sep–Nov): Air quality generally improves as temperatures drop, though early fall can still carry wildfire smoke in the Southeast region.
Winter (Dec–Feb): AQI near 47. Cold-air temperature inversions can trap PM2.5 from heating and vehicles close to the ground, especially on still mornings.
Is It Safe to Exercise Outside in Charlotte?
With Charlotte's AQI at 41 (Good), outdoor exercise is generally safe for most people. Conditions are good for running, cycling, and outdoor sports at any time of day.
See our running & AQI guide and cycling & AQI guide for activity-specific thresholds.
What's Causing Charlotte's Air Pollution?
In Charlotte, the leading pollutant is ground-level ozone (O3). As part of the Southeast region, the main drivers of air pollution here are:
- •Vehicle emissions worsened by urban sprawl and car dependency
- •Power-plant emissions from the regional energy grid
- •High humidity that traps pollutants near ground level
- •Seasonal wildfire and prescribed-burn smoke
Dig deeper: Charlotte PM2.5 levels · Charlotte ozone levels
Air Purifier & Monitor Buying Guides
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PM2.5 Levels
Fine particulate matter data →
Ozone Levels
Ground-level ozone data →
Seasonal Guides
Air quality by season →
Health Effects
Learn about air pollution impacts →
Frequently Asked Questions About Charlotte Air Quality
What is the current air quality in Charlotte?
The current Air Quality Index (AQI) in Charlotte, NC is 41, which is considered good.
Is it safe to exercise outdoors in Charlotte?
Yes, with an AQI of 41, outdoor exercise is safe for everyone in Charlotte.
When is the best time of year to visit Charlotte for good air quality?
Spring and early fall typically offer the best air quality in Charlotte. Summer months may have elevated ozone levels, while winter can see higher PM2.5 from temperature inversions.
What causes air pollution in Charlotte?
Air pollution in Charlotte can come from vehicle emissions, industrial activity, construction, wildfires, and weather patterns. Local geography and seasonal factors also play a significant role.
Explore More Air Quality Data
Reduce Indoor Ozone in Charlotte
Today's main pollutant in Charlotte is ground-level ozone (AQI 41). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Compare activated-carbon purifiers (for gases & ozone):
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