NO2 in Winston-Salem, NC
Real-time Nitrogen Dioxide monitoring and health recommendations
Current NO2 Levels
Overall AQI
About Nitrogen Dioxide
A reddish-brown gas from burning fuel, can irritate airways.
Measured in ppb
Health Impact
Air quality is considered satisfactory, and air pollution poses little or no risk.
What Is a Safe Level of NO2?
By the EPA Air Quality Index, nitrogen dioxide is Good — safe for everyone up to 53 ppb (AQI 0–50). From 53 to 100 ppb is Moderate (AQI 51–100): acceptable for most people, though unusually sensitive individuals may notice symptoms. Above 100 ppb the air turns Unhealthy for Sensitive Groups and EPA health guidance applies.
Winston-Salem is currently at AQI 21 (≈22 ppb, estimated) for NO2 — within the Good range, so NO2 levels are safe for everyone right now.
Thresholds are the official EPA AQI category breakpoints for nitrogen dioxide (1-hour standard). The current concentration is estimated from the measured AQI sub-index; the exact value within a band is not recoverable from the index alone.
Sources of NO2
• Vehicle emissions (cars, trucks, buses)
• Power plants and industrial boilers
• Off-road equipment and engines
• Residential heating systems
Other Pollutants
Full Air Quality Report
View all pollutants and comprehensive air quality data for Winston-Salem.
View Full ReportFilter Combustion Gases in Winston-Salem
The dominant pollutant in Winston-Salem is a combustion gas (NO2), AQI 21. Particle (HEPA) filtration alone won't capture gases — you want a purifier with a real activated-carbon stage, which adsorbs nitrogen dioxide, sulfur dioxide and traffic/industrial fumes that seep indoors.
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Filter Combustion Gases in Winston-Salem
The dominant pollutant in Winston-Salem is a combustion gas (NO2), AQI 21. Particle (HEPA) filtration alone won't capture gases — you want a purifier with a real activated-carbon stage, which adsorbs nitrogen dioxide, sulfur dioxide and traffic/industrial fumes that seep indoors.
Compare activated-carbon purifiers (for gases):
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