SmogRank / Cleaner or dirtier / Hong Kong
Hong Kong: cleaner or dirtier, 2025
In Hong Kong, 13 cities have enough days in both years to compare 2025 with the same days of 2024: 3 got dirtier and 10 cleaner.
The 3 cities that got dirtier, biggest rise first
| # | City | 2024 | 2025 | Change |
|---|---|---|---|---|
| 1 | Sau Mau PingKwun Tong District, Hong Kong | 60 | 61 | +0.2 µg/m³+1% |
| 2 | Kwai ChungKwai Tsing District, Hong Kong | 63 | 63 | +0.1 µg/m³+1% |
| 3 | Sham Shui PoSham Shui Po District, Hong Kong | 62 | 62 | +0.1 µg/m³+1% |
The 10 cities that got cleaner, biggest fall first
| # | City | 2024 | 2025 | Change |
|---|---|---|---|---|
| 1 | Tuen MunHong Kong | 73 | 70 | −1.7 µg/m³−8% |
| 2 | Mong KokYau Tsim Mong District, Hong Kong | 67 | 65 | −1.1 µg/m³−6% |
| 3 | Tsuen WanHong Kong | 63 | 61 | −1.1 µg/m³−7% |
| 4 | Wan ChaiHong Kong | 79 | 77 | −0.8 µg/m³−3% |
| 5 | VictoriaCentral and Western, Hong Kong | 61 | 59 | −0.6 µg/m³−4% |
| 6 | Tin Shui WaiYuen Long, Hong Kong | 66 | 65 | −0.6 µg/m³−3% |
| 7 | Sha TinHong Kong | 59 | 58 | −0.5 µg/m³−4% |
| 8 | Tai PoHong Kong | 63 | 63 | −0.5 µg/m³−3% |
| 9 | FanlingNorth District, Hong Kong | 65 | 64 | −0.5 µg/m³−3% |
| 10 | San Tung Chung HangIslands, Hong Kong | 67 | 66 | −0.2 µg/m³−1% |
Means in US AQI over the days a city was measured in both years, the same calendar days each year; a city needs 55% of the days paired, and at least 30. The change is in µg/m³ and per cent. How we compare.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
Updated 2026-10-07 12:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.