By bnm Tehran bureau Tehran's air quality has plunged to a critical 'very unhealthy' and 'hazardous' state on July 7, with the city's Air Pollution Index (API) soaring past 300 in the last 24 hours, ...

First of Its Kind Cross-Regional Citizen Science Air Quality Monitoring Project in Surabaya, Indonesia; Ogijo, Nigeria; ...

According to the Maricopa County Air Quality Map, several parts of the Valley had an air quality level listed in the "very ...