Tehran, Nov 2, IRNA-The Department of the Environment announced on Wednesday that Tehran's residents experienced only one pollution-free day during the last Iranian month (Sept 23-Oct 22).
Tehran's Department of the Environment Director-General Qavameddin Bozorgian said 66 percent of the days of the Iranian month of Mehr registered "healthy conditions," indicating a 34 percent growth compared with the corresponding period last year.
He added that people in Tehran breathed "unhealthy air" during 33 percent of the days registering a 37 percent decline in the same period.
"Carbon monoxide and suspended particles in Tehran's air declined during September 23 to October 22 compared with the air composition in the corresponding period of last year," he said, adding that this year's air quality has improved.
Bozorgian noted that Tehran residents experienced "clean conditions" in the last month in terms of air pollutants such as ozone-depleting agents, nitrogen dioxide and sulfur dioxide.
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