Tehran Skies Get Duller in April as Pollution Worsens

Citizens of Iran's capital Tehran inhaled more poisonous air in April than in the same month of the previous year, data released by Tehran Air Quality Control Company show.
Charts published on TAQCC’s website, Airnow.tehran.ir, show that clean blue skies were not seen for even a single day, indicating that the air quality index did not fell into the "good" category in that month.
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).
Moderate air pollution status dominated the month, keeping the index between 51 and 100 in 28 days. TAQCC data show that during the period, sensitive groups in the capital were warned to limit their outdoor activities in the remaining two days, as the index entered the threshold of 101-150 that categorizes the condition as “unhealthy for sensitive groups”.
Children, the elderly, pregnant women and those with respiratory and cardiovascular conditions fall in the above group.