SO2 in Houston, TX
Real-time Sulfur Dioxide monitoring and health recommendations
Current SO2 Levels
Overall AQI
About Sulfur Dioxide
A gas from burning fossil fuels, can affect breathing.
Measured in ppb
Health Impact
Members of sensitive groups may experience health effects. The general public is not likely to be affected.
Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion.
What Is a Safe Level of SO2?
By the EPA Air Quality Index, sulfur dioxide is Good — safe for everyone up to 35 ppb (AQI 0–50). From 35 to 75 ppb is Moderate (AQI 51–100): acceptable for most people, though unusually sensitive individuals may notice symptoms. Above 75 ppb the air turns Unhealthy for Sensitive Groups and EPA health guidance applies.
Houston is currently at AQI 101 (≈76 ppb, estimated) for SO2 — above the safe-for-everyone threshold, so sensitive groups should limit outdoor exposure until levels drop.
Thresholds are the official EPA AQI category breakpoints for sulfur 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 SO2
• Fossil fuel combustion at power plants
• Industrial facilities and refineries
• Metal processing operations
• Volcanic eruptions (natural source)
Other Pollutants
Full Air Quality Report
View all pollutants and comprehensive air quality data for Houston.
View Full ReportFilter Combustion Gases in Houston
The dominant pollutant in Houston is a combustion gas (SO2), AQI 101. 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 Houston
The dominant pollutant in Houston is a combustion gas (SO2), AQI 101. 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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