Angra do Heroísmo vs Portela AQI Comparison

Side-by-side OpenAQ-derived air quality comparison for Angra do Heroísmo and Portela. Values use mapped daily PM2.5 and PM10 observations normalized to US EPA AQI.

Lower average AQI: Angra do Heroísmo (34-pt gap)PM2.5: Angra do Heroísmo 2.7 ug/m3 · Portela 11.2 ug/m3

Source: OpenAQ local exports mapped to AQI Now cities; city summaries cover 2024-09-20–2024-12-30 and 2024-01-01–2024-09-22.

Compare two cities

City A

City B

Angra do Heroísmo vs Portela

Angra do Heroísmo

Azores, Portugal

PM2.5: 2.7 ug/m3
PM10: 10.2 ug/m3
Worst month: November
Trend: n/a

EPA category: Good

Portela

Lisboa, Portugal

PM2.5: 11.2 ug/m3
PM10: 20.4 ug/m3
Worst month: January
Trend: n/a

EPA category: Good

Lower average AQI in this selected period: Angra do Heroísmo. Values are historical OpenAQ-derived city summaries, not live readings.

Yearly EPA AQI trend

Seasonal EPA AQI heatmap

JanFebMarAprMayJunJulAugSepOctNovDec

Angra do Heroísmo

Portela

What this comparison measures

Average EPA AQI — city-level daily AQI values averaged across the OpenAQ coverage window.
PM2.5 and PM10 — mapped monitor concentrations aggregated to daily city averages.
Seasonality — worst and cleanest months from the monthly city rollups.
Trend — difference between the earliest and latest yearly AQI average in this build.