✏️✏️air pollution has led to the closure of schools in Tehran and several other cities for a second consecutive day. this problem is not limited to iranian cities and is also seen in a number of other megacities around the wold.
📚📚what are the main factors contributing to air pollution?
📚📚why can't relevant officials find a long-term solution to this problem?
📚📚who is (are) to blame for air pollution?