Clean Air Still Elusive in Tehran

Air quality monitoring stations around the capital city show residents took a heavier breath in November compared with October and the corresponding month of last year.
Charts regularly published by Tehran Air Quality Control Company’s website, Airnow.tehran.ir, indicate that “good” quality was not recorded even for a day and has become a thing of the past. 
The index categorizes air conditions according to 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 shows that “moderate” status was recorded in one-thirds of the month, with AQI hovering between 51 and 100 in 10 days.