Gimpo vs Ulchin AQI Comparison

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

Lower average AQI: Ulchin (22-pt gap)PM2.5: Gimpo 18.5 ug/m3 · Ulchin 9.9 ug/m3

Source: OpenAQ local exports mapped to AQI Now cities; city summaries cover 2024-03-19–2024-12-31 and 2024-03-20–2024-12-31.

Compare two cities

City A

City B

Gimpo vs Ulchin

Gimpo

Gyeonggi, South Korea

PM2.5: 18.5 ug/m3
PM10: 32.0 ug/m3
Worst month: April
Trend: n/a

EPA category: Moderate

Ulchin

Gyeongbuk, South Korea

PM2.5: 9.9 ug/m3
PM10: 23.5 ug/m3
Worst month: April
Trend: n/a

EPA category: Good

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

Yearly EPA AQI trend

Seasonal EPA AQI heatmap

JanFebMarAprMayJunJulAugSepOctNovDec

Gimpo

Ulchin

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.