A Health Ministry officials says 14 Iranian power plans currently burn mazut, a low-quality fuel oil that negatively affects the quality of air.
Speaking to Tasnim News Agency, Abbas Shahsavani, a senior climate official, said burning mazut in the power plants located far from cities leaves less negative impacts on air quality.
But in cities such as Esfahan, Arak, where power plants are situated near human settlements, using fuel oil leads to the concentration of suspended particles and sulfur dioxide.
He said in the last Persian calendar year, which ended on March 20, 2022, the number of days with clean air decreased by five percent, in comparison with a year earlier.
The cities of Tehran, Karaj, Ahvaz and Esfahan had a mere 10 days with clean air last year.
Residents of the capital and other major Iranian cities have witnessed several weeks of polluted air since the start of the cold season, with only short let-ups usually caused by downpours or wind blow.
The smog is mostly caused by heavy traffic as well as factory pollution.
Many attribute a major part of the problem to a rise in the use of mazut as fuel in factories.
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