The Iranian Meteorological Organization has warned of worsening air pollution in the nation's five major cities with several schools moving to online learning.

The air quality in five cities, Tehran, Karaj, Arak, and Esfahan (Isfahan), has been put in place until Thursday, signifying a level of air quality deemed "very unhealthy."

Mehdi Pirhadi, a member of parliament, expressed concern about the deterioration of air quality and the rising concentration of pollutants. He highlighted that the number of polluted days in major cities this year has seen a notable increase compared to the previous year.