Pollutant Levels
Compared to WHO 24-hour guideline values
PM2.5
—μg/m³
No data
WHO limit 15 μg/m³
Fine particles that penetrate deep into lungs. Main contributor to respiratory disease.
PM10
—μg/m³
No data
WHO limit 45 μg/m³
Coarse particles from dust, pollen, and mould. Can irritate eyes and airways.
Ozone (O₃)
—μg/m³
No data
WHO limit 100 μg/m³
Ground-level ozone formed by chemical reactions. Can cause breathing problems.
NO₂
—μg/m³
No data
WHO limit 25 μg/m³
Nitrogen dioxide mainly from vehicle exhausts. Inflames airways and reduces immunity.
SO₂
—μg/m³
No data
WHO limit 40 μg/m³
Sulphur dioxide from burning fossil fuels. Irritates the respiratory system.
CO
—mg/m³
No data
WHO limit 4 mg/m³
Carbon monoxide from incomplete combustion. Reduces oxygen delivery to organs.
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About Air Quality Index
Monitor local air quality in real time on the US AQI scale (0–500) alongside the UK Defra index (1–10). Track PM2.5, PM10, ozone, nitrogen dioxide, sulphur dioxide and carbon monoxide, each compared with the WHO guideline.
How to use this page
- Search any city: Type a city name to see air quality data for that location worldwide.
- My Location: Click to share your location and view air quality conditions where you are right now.
- Two scales: The US AQI (0–500) is shown with the UK Defra index (1–10), so you can read it against either standard.
- Pollutant details: Expand each pollutant type to see individual readings and health recommendations.
Air quality data facts
- PM2.5 (Fine particles): Tiny particles that penetrate deep into lungs. Main contributor to respiratory disease.
- PM10 (Coarse particles): Larger particles from dust, pollen, and mould. Can irritate eyes and airways.
- Ozone (O₃): Ground-level ozone formed by chemical reactions. High levels can cause breathing problems.
- Nitrogen Dioxide (NO₂): Mainly from vehicle exhausts. Inflames airways and reduces immunity.
- US AQI: Scale from 0 (Good) to 500+ (Hazardous). Higher numbers mean more health concerns.