Calpulalpan vs Saltillo AQI Comparison

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

Lower average AQI: Calpulalpan (98-pt gap)PM2.5: Calpulalpan 3.5 ug/m3 · Saltillo 36.0 ug/m3

Source: OpenAQ local exports mapped to AQI Now cities; city summaries cover 2024-10-10–2024-12-05 and 2024-01-15–2024-12-27.

Compare two cities

City A

City B

Calpulalpan vs Saltillo

Calpulalpan

Tlaxcala, Mexico

PM2.5: 3.5 ug/m3
PM10: n/a ug/m3
Worst month: November
Trend: n/a

EPA category: Good

Saltillo

Coahuila, Mexico

117

PM2.5: 36.0 ug/m3
PM10: 111.6 ug/m3
Worst month: April
Trend: n/a

EPA category: Unhealthy for Sensitive Groups

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

Yearly EPA AQI trend

Seasonal EPA AQI heatmap

JanFebMarAprMayJunJulAugSepOctNovDec

Calpulalpan

Saltillo

162

100

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.