The air quality index in the Iranian capital, Tehran, stood at 134 on Sunday, like in previous days, falling into the Orange Category, that is dangerous for sensitive groups, on the national color-coded classification system.
Six spots in the metropolis are in the Red status, which is the most dangerous level of air pollution.
Under these conditions, children, pregnant women and patients suffering from heart and lung diseases are advised not to stay out in the open.
In addition to Tehran, other big cities like Mashhad and Isfahan face the air pollution during cold weather.
The pollution is mainly caused by cars and to some extent factories near the polluted cities.
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