Tehran Air Cleaner in August

Air quality control stations in the capital city of Tehran have recorded better air quality in August compared to the year-ago month. 
According to charts published by Tehran Air Quality Control Company’s website, Airnow.tehran.ir, Tehran’s residents experienced mostly “moderate” air quality during the month, meaning that the Air Quality Index stood between 51 and 100 on 26 days.
The index categorizes conditions dictated by a measure of polluting matters into good (0-50), moderate (51-100), unhealthy for sensitive groups (101-150), unhealthy (151-200), very unhealthy (201-300) and hazardous (301-500). 
TAQCC data show that the remaining four days of August were unhealthy for the sensitive group, as AQI hovered between 101 and 150.
During these four days, the sensitive group, which includes children, the elderly, pregnant women and those with respiratory and cardiovascular conditions, were advised to limit their outdoor activities.