Air quality — AQI & PM2.5
55
AQI in 서울특별시
Unusually sensitive people should limit prolonged outdoor exertion.
- PM2.5
- 5.2 µg/m³
- PM10
- 6.2 µg/m³
- O3
- 66 µg/m³
- NO2
- 20.1 µg/m³
- SO2
- 5.8 µg/m³
- CO
- 239 µg/m³
Updated 10. 18. 15:00 · Source: CAMS / Open-Meteo · AQI on the US EPA scale · Hourly details for 서울특별시 →
Quick links: 서울특별시 air quality · 부산광역시 air quality
Most polluted places today
Worldwide, by current AQI
- 1팔렘방 (Indonesia)201Very unhealthy
- 2자카르타 (Indonesia)189Unhealthy
- 3다카 (Bangladesh)176Unhealthy
- 4메단 (Indonesia)154Unhealthy
- 5모스크바 (Nga)154Unhealthy
- 6우루무치 시 (Trung Quốc)138Unhealthy for sensitive groups
- 7싱가포르 (Singapore)132Unhealthy for sensitive groups
- 8수라바야 (Indonesia)129Unhealthy for sensitive groups
- 9카라치 (Pakistan)129Unhealthy for sensitive groups
- 10류블랴나 (Slovenia)112Unhealthy for sensitive groups
Cleanest: 더블린 (22) · Amsŭt'erŭdam (22) · 멕시코시티 (24) · 런던 (26) · 오슬로 (26)
Pollution ranking of cities in Hàn Quốc
Provincial capitals and major cities, highest AQI first
AQI scale (US EPA)
| AQI | Level |
|---|---|
| 0–50 | Good |
| 51–100 | Moderate |
| 101–150 | Unhealthy for sensitive groups |
| 151–200 | Unhealthy |
| 201–300 | Very unhealthy |
| 301+ | Hazardous |
Tracking air pollution worldwide
This page tracks air quality (AQI) and concentrations of fine particles PM2.5, PM10 and the gases O₃, NO₂, SO₂ and CO for provinces and cities worldwide. Air pollution — especially PM2.5 — is a leading cause of respiratory and heart disease in large cities.
Air quality FAQ
What is the air quality today?
Choose a country and province/area above (or tap “My location”) to see the US EPA AQI and current PM2.5, PM10, O₃, NO₂, SO₂ and CO, with health advice for each level.
What is AQI and what level is safe?
AQI (Air Quality Index) converts pollutant concentrations to a 0–500 scale: 0–50 Good, 51–100 Moderate, 101–150 Unhealthy for sensitive groups, 151–200 Unhealthy, 201–300 Very unhealthy, over 300 Hazardous. Below 100 is fairly safe for most people.
What is PM2.5 and why is it dangerous?
PM2.5 are particles ≤ 2.5 micrometres across, small enough to reach deep into the lungs and blood, causing respiratory and heart disease and worsening asthma. It is the most harmful pollutant in large cities.
What should I do when the air is polluted?
Limit time and exercise outdoors when AQI is high; wear a mask rated for fine particles; close windows and use an air purifier; take special care of children, older people and those with respiratory illness.
Where does the data come from?
Air quality data comes from the CAMS model (Copernicus Atmosphere Monitoring Service) via Open-Meteo, updated several times a day for every location worldwide.