Convert Dylos particle count to PM2.5 concentration
Little to no health risk. Air quality is satisfactory.
Unusually sensitive individuals may experience respiratory symptoms.
People with respiratory or heart disease, elderly and children should limit prolonged exertion.
Everyone may begin to experience health effects. Sensitive groups should avoid prolonged exertion.
Health alert: everyone may experience serious health effects. Avoid outdoor activity.
Health emergency: everyone should avoid any outdoor exertion. Stay indoors.
Conversion based on polynomial regression from MyHealthBeijing. AQI reference from AirNow.gov.