Christchurch vs Dunedin AQI Comparison

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

Lower average AQI: Dunedin (10-pt gap)PM2.5: Christchurch 8.2 ug/m3 · Dunedin 5.8 ug/m3

Source: OpenAQ local exports mapped to AQI Now cities; city summaries cover 2024-01-03–2024-12-31 and 2024-07-24–2024-12-31.

Compare two cities

City A

City B

Christchurch vs Dunedin

Christchurch

Canterbury, New Zealand

PM2.5: 8.2 ug/m3
PM10: 13.6 ug/m3
Worst month: July
Trend: n/a

EPA category: Good

Dunedin

Otago, New Zealand

PM2.5: 5.8 ug/m3
PM10: 6.5 ug/m3
Worst month: July
Trend: n/a

EPA category: Good

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

Yearly EPA AQI trend

Seasonal EPA AQI heatmap

JanFebMarAprMayJunJulAugSepOctNovDec

Christchurch

Dunedin

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.