Tehran Air Quality Improves

The residents of Iranian capital inhaled less polluted air in June compared with the same period of last year, although ground ozone still persists among the buoyant particles in the air, Tehran Municipality’s data show.
However, charts published by Tehran Air Quality Control Company’s website, Airnow.tehran.ir, show that the air quality index did not fall under 50. 
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 during the month, “moderate” status was the most prevailing air condition, as the index hovered between 51 and 100 on  21 days in June.
Sensitive groups in the capital were advised to limit their outdoor activities due to air pollution in two consecutive days, as the index entered the threshold of unhealthy for the sensitive group (101-150) in the remaining nine days.