Chart air quality data
What’s new
Air quality categories for PM2.5 and sulfur dioxide have been updated to align with changes to national guidelines
About Nitrogen dioxide
Nitrogen dioxide is an acidic and highly corrosive gas. Nitrogen oxides are critical components of photochemical smog. Long-term exposure to high levels of nitrogen dioxide can cause chronic lung disease and affect the senses.
The guideline for Nitrogen dioxide is 0.08ppm (1hr avg).
Nitrogen dioxide is measured in parts per million.
