Sa-ch’on vs Sapkyo AQI Comparison

Side-by-side OpenAQ-derived air quality comparison for Sa-ch’on and Sapkyo. Values use mapped daily PM2.5 and PM10 observations normalized to US EPA AQI.

Lower average AQI: Sa-ch’on (20-pt gap)PM2.5: Sa-ch’on 10.3 ug/m3 · Sapkyo 18.6 ug/m3

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

Compare two cities

City A

City B

Sa-ch’on vs Sapkyo

Sa-ch’on

Gyeongnam, South Korea

PM2.5: 10.3 ug/m3
PM10: 21.6 ug/m3
Worst month: April
Trend: n/a

EPA category: Good

Sapkyo

Chungnam, South Korea

PM2.5: 18.6 ug/m3
PM10: 30.5 ug/m3
Worst month: April
Trend: n/a

EPA category: Moderate

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

Yearly EPA AQI trend

Seasonal EPA AQI heatmap

JanFebMarAprMayJunJulAugSepOctNovDec

Sa-ch’on

Sapkyo

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.