Greensboro vs Winston-Salem Air Quality Comparison
Which city has cleaner air right now, from the latest EPA AirNow AQI
As of September 23, 2026, Greensboro, NC and Winston-Salem, NC have effectively the same air quality — both at AQI 23 (Good) in the latest EPA AirNow observations. Greensboro's reading is driven by O3 and Winston-Salem's by O3.
Greensboro, NC
Good
Winston-Salem, NC
Good
Summary
Both cities have similar air quality
Reduce Indoor Ozone in Winston-Salem
Today's main pollutant in Winston-Salem is ground-level ozone (AQI 23). 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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5-Day Forecast Comparison
| Day | Greensboro | Winston-Salem | Better |
|---|---|---|---|
| Today | AQI 22 | AQI 22 | Tie |
| Wed, Sep 23 | AQI 24 | AQI 24 | Tie |
| Thu, Sep 24 | AQI 40 | AQI 40 | Tie |
| Fri, Sep 25 | AQI 42 | AQI 42 | Tie |