PM2.523 µg/m3PM1034 µg/m3
SO25 µg/m3OZONE125 µg/m3
NO236 µg/m3CO0.4 µg/m3
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According The National Ambient Air Quality Standards for Particle Pollution to caculate AQI

Air Quality Index (AQI) Values Levels of Health Concern Colors
0 to 50 Good No health implications.
51 to 100 Moderate Few hypersensitive individuals should reduce outdoor exercise.
101 to 150 Unhealthy for Sensitive Groups Slight irritations may occur, individuals with breathing or heart problems should reduce outdoor exercise.
151 to 200 Unhealthy May have harmful impacts on patients and members of sensitive groups (children, aged or weak people), and also cause the general public unpleasant feelings.
201 to 300 Very Unhealthy Healthy people will be noticeably affected. People with breathing or heart problems will experience reduced endurance in activities. These individuals and elders should remain indoors and restrict activities.
301 to 500 Hazardous Healthy people will experience reduced endurance in activities. There may be strong irritations and symptoms and may trigger other illnesses. Elders and the sick should remain indoors and avoid exercise. Healthy individuals should avoid out door activities.
Hongkou Air quality index Updated on 2021-06-23 03:00:00 , Hongkou AQI (Air quality index) is 73. Hongkou PM2.5 (fine particulate matter) AQI is 73 - Hongkou PM10 (respirable particulate matter) AQI is 31 - Hongkou NO2 (nitrogen dioxide) AQI is 33 - Hongkou SO2 (sulfur dioxide) AQI is 7 - Hongkou O3 (ozone) AQI is 39

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