Air quality now
Air quality in Hong Kong
Hong Kong
Well above WHO limits — NO₂ is 3.5× the WHO limit
🚬 Breathing this all day ≈ smoking 1.7 cigarettes
Each ball below is a pollutant measured in Hong Kong, sized against WHO safe limits — it's a snapshot of the air, not a map.
- PM2.538 µg/m³2.5×
- PM1039 µg/m³0.9×
- NO₂89 µg/m³3.5×
- O₃40 µg/m³0.4×
- SO₂33 µg/m³0.8×
- CO519 µg/m³0.1×
What you're seeing
Each ball is a pollutant measured in Hong Kongright now. The more balls of a colour, the more of that pollutant is in the air — normalised against the World Health Organization's safe limits, so a hazy city looks unmistakably denser than a clean one. Data is live from Open-Meteo / CAMS. How Polly works →
Want your own city and a hay-fever pollen view? Open the live map, or track your symptoms against the air.