South Korea

Cheongju

Name: Cheongju
Address: South Korea

119

Unhealthy for Sensitive Groups

Air Quality Index

Updated Mar 21, 02:00 AM · Data from OpenAQ

Current Pollution Levels in Cheongju

PM2.5

Sensitive

µg/m³

PM10

Moderate

µg/m³

O₃

—

0.0186

ppm

Cheongju Air Quality 24-Hour Trend

Air Quality Analysis for Cheongju

Cheongju, South Korea air quality this morning is rated Unhealthy for Sensitive Groups with an Air Quality Index (AQI) of 119. The primary pollutant PM2.5 is measured at 43 µg/m³. PM10 (coarse particles) is at 63 µg/m³.

The current PM2.5 level exceeds the WHO annual guideline of 15 µg/m³ but remains within the 24-hour limit of 45 µg/m³. Long-term exposure at this level may still affect sensitive individuals.

PM2.5 levels are stable, staying close to the recent average of 37.0 µg/m³.

Health Recommendation

Sensitive groups in Cheongju — including children, elderly, and those with asthma or heart disease — should limit prolonged outdoor activity. Consider wearing an N95 mask if spending extended time outdoors.

Outdoor Exercise

Reduce intensity

Window Ventilation

Keep windows closed

Recent Cheongju Air Quality Measurements

Time	AQI	PM2.5	PM10
02:00 AM	119	43	63
01:00 AM	112	40	53
12:00 AM	102	36	50
11:55 PM	102	36	50
11:22 PM	107	38	53
11:08 PM	87	29	53

Frequently Asked Questions

Is air quality in Cheongju safe today?

Cheongju air quality is unhealthy for sensitive groups today (AQI 119). Children, elderly, and people with respiratory conditions should limit prolonged outdoor exposure.

What AQI level is considered unhealthy?

According to EPA standards, AQI 0-50 is Good, 51-100 is Moderate, 101-150 is Unhealthy for Sensitive Groups, 151-200 is Unhealthy, 201-300 is Very Unhealthy, and above 300 is Hazardous. The WHO recommends annual PM2.5 levels below 15 µg/m³ for optimal health.

Should I wear a mask today in Cheongju?

With Cheongju's AQI at 119, wearing an N95 mask is recommended for outdoor activities, especially for sensitive groups. PM2.5 levels are at 43 µg/m³, which exceeds the EPA moderate threshold.