Hong Kong City AQI Comparison
Rank cities side by side using OpenAQ PM2.5 and PM10 history normalized to US EPA AQI. This pilot covers 11 eligible cities with OpenAQ-derived daily AQI history.
Compare two cities
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Featured comparisons
Hong Kong vs Sha Tin→
Highest vs cleanest city
AQI gap 26364 / 364 days
Hong Kong vs Tin Shui Wai→
Highest-AQI pair
AQI gap 12364 / 365 days
Hong Kong vs Shek Wai Kok→
High vs mid-range city
AQI gap 19364 / 363 days
Tin Shui Wai vs Sha Tin→
Second-highest vs cleanest city
AQI gap 14365 / 364 days
Sham Shui Po vs Sai Wan Ho→
High vs low-AQI city
AQI gap 6365 / 364 days
Tin Shui Wai vs Sai Wan Ho→
High vs low-AQI city
AQI gap 11365 / 364 days
Tin Shui Wai vs Sham Shui Po→
Similar high-AQI cities
AQI gap 5365 / 365 days
Sham Shui Po vs Lam Tin→
High vs low-AQI city
AQI gap 5365 / 364 days
Sham Shui Po vs Wan Tau Tong→
Similar high-AQI cities
AQI gap 1365 / 365 days
Wan Tau Tong vs Central District→
High vs low-AQI city
AQI gap 4365 / 363 days
Wan Tau Tong vs San Tung Chung Hang→
Similar high-AQI cities
AQI gap 0365 / 364 days
San Tung Chung Hang vs Kwai Chung→
High vs low-AQI city
AQI gap 1364 / 364 days
Methodology
The extractor maps OpenAQ monitoring locations to the nearest AQI Now city in the same country, aggregates PM2.5 and PM10 to daily city averages, and converts those concentrations to US EPA AQI. Country tool pages use only city summaries that satisfy the configured minimum daily coverage threshold.