Public Transport Problems and Tehran’s All-Pervasive Smog

The inefficient public transportation network in the Iranian capital has been repeatedly blamed for exacerbating Tehran’s suffocating air pollution, which recently hit the emergency level.
The worsening air quality has forced schools and universities to shut down and sent hundreds of people to medical emergency rooms.
The poor quality of public transportation services is one of the factors frequently blamed by experts for the deteriorating air pollution.
The city’s transport system comprises taxis, buses and the subway network, the first two of which are mostly dilapidated as both fleets’ average age is over 10 years. 
Besides, the more efficient subway system is still under construction and the operating lines are usually overcrowded, making subway commute a nightmare, especially during the rush hours.
Still many prefer the train congestion over choking from toxic air in some old four-wheelers.