Portela vs Santa Cruz AQI Comparison

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

Lower average AQI: Santa Cruz (32-pt gap)PM2.5: Portela 11.2 ug/m3 · Santa Cruz 3.4 ug/m3

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

Compare two cities

City A

City B

Portela vs Santa Cruz

Portela

Lisboa, Portugal

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

EPA category: Good

Santa Cruz

Madeira, Portugal

PM2.5: 3.4 ug/m3
PM10: 13.0 ug/m3
Worst month: December
Trend: n/a

EPA category: Good

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

Yearly EPA AQI trend

Seasonal EPA AQI heatmap

JanFebMarAprMayJunJulAugSepOctNovDec

Portela

Santa Cruz

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.