A survey on the correlation between PM_2.5 concentration and the incidence of suspected and positive cases of COVID-19 referred to medical centers: A case study of Tehran.

In winter, in unhealthy conditions, an increasing trend was observed in referring suspected cases compared to yellow and orange conditions to medical centers.

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with the beginning of the Iranian New Year (Nowruz) and the departure of a percentage of the city's population to travel, the AQI (due to less traffic) decreased and consequently, the occurrence of positive and suspicious cases had a decreasing trend ( Fig. 1 ; March 15 to 30, 2020).

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