miguel díazl , the president of cuba, who traveled to tehran at the invitation of his iranian counterpart is going to be officially welcomed by mr. raisi in the historical cultural complex of saad abad. during the visit of the president of cuba to iran, several memorandums of cooperation between the two countries will be signed. after the visit of the late cuban president fidel castro in june 1380, this is the first visit of the president of this country to iran. according to the meteorological organization , there is air pollution for some cities today mr. zarabi is in the studio with us . mr. zarabi. hello, good morning . in which cities is this air pollution more colorful and how long will it last? this means that these conditions will continue until wednesday, so we are facing the accumulation and increase in the concentration of pollutants in the big cities and industrial cities, including in tehran, where the average air quality index in tehran is now 137, which is unhealthy for sensitive groups , yesterday, now for 24 last hour, this number was 154 it was unhealthy for all people i