Portugal City AQI Comparison
Rank cities side by side using OpenAQ PM2.5 and PM10 history normalized to US EPA AQI. This pilot covers 58 eligible cities with OpenAQ-derived daily AQI history.
Compare two cities
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Featured comparisons
Lousã vs Vila Real→
Highest vs cleanest city
AQI gap 52358 / 273 days
Lousã vs Lordelo do Ouro→
Highest-AQI pair
AQI gap 4358 / 153 days
Lousã vs Santiago do Cacém→
High vs mid-range city
AQI gap 31358 / 285 days
Lordelo do Ouro vs Vila Real→
Second-highest vs cleanest city
AQI gap 48153 / 273 days
Portela vs Angra do Heroísmo→
High vs low-AQI city
AQI gap 3468 / 94 days
Lordelo do Ouro vs Angra do Heroísmo→
High vs low-AQI city
AQI gap 45153 / 94 days
Lordelo do Ouro vs Portela→
Similar high-AQI cities
AQI gap 11153 / 68 days
Portela vs Santa Cruz→
High vs low-AQI city
AQI gap 3268 / 309 days
Portela vs Aldeia de Paio Pires→
Similar high-AQI cities
AQI gap 168 / 69 days
Aldeia de Paio Pires vs Ponte de Lima→
High vs low-AQI city
AQI gap 3069 / 186 days
Aldeia de Paio Pires vs Lisbon→
Similar high-AQI cities
AQI gap 069 / 198 days
Lisbon vs Faro→
High vs low-AQI city
AQI gap 28198 / 320 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.