The Major Pollutants
Carbon monoxide (CO) is a toxic, colorless gas from vehicle and industrial emissions. High CO AQI reduces oxygen delivery, posing health risks.
Nitrogen dioxide (NO₂) is a reddish-brown gas from vehicle exhaust and industrial emissions. High NO₂ AQI causes respiratory issues and worsens air pollution.
Ozone (O₃) at ground level is a harmful pollutant formed by chemical reactions in sunlight. High O₃ AQI causes respiratory issues and reduces air quality.
PM2.5 are fine particulate matter (≤2.5µm) from vehicle emissions, industries, and fires. High PM2.5 AQI causes respiratory and cardiovascular issues.
PM10 are coarse particles (≤10µm) from dust, construction, and industries. High PM10 AQI affects respiratory health and reduces air quality.
Sulfur dioxide (SO₂) is a toxic gas from burning fossil fuels and industrial processes. High SO₂ AQI causes respiratory issues and acid rain.