Campbell River vs Welland AQI Comparison

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

Lower average AQI: Campbell River (33-pt gap)PM2.5: Campbell River 3.0 ug/m3 · Welland 12.1 ug/m3

Source: OpenAQ local exports mapped to AQI Now cities; city summaries cover 2024-01-01–2025-01-01 and 2024-07-21–2025-01-01.

Compare two cities

City A

City B

Campbell River vs Welland

Campbell River

British Columbia, Canada

PM2.5: 3.0 ug/m3
PM10: n/a ug/m3
Worst month: October
Trend: n/a

EPA category: Good

Welland

Ontario, Canada

PM2.5: 12.1 ug/m3
PM10: 13.1 ug/m3
Worst month: July
Trend: n/a

EPA category: Good

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

Yearly EPA AQI trend

Seasonal EPA AQI heatmap

JanFebMarAprMayJunJulAugSepOctNovDec

Campbell River

Welland

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.