Population growth and urban development are of the effective factors of increasing air temperature in urban areas that may cause formation of heat island which itself influences air quality and as a result, public health. In this research the minimum and maximum temperature of Tehran (Mehrabad and Dushantappeh) and Ghazvin stations have been observed in a long-term statistic period to investigate the possibility of the heat island existence in Tehran. The relation of heat island with population and with amount of surface ozone has been also investigated. The results of the research show that the air temperature of Tehran station has an increasing rate and that this increasing rate is faster comparing with that of Ghazvin station. The increasing rate of minimum temperature is more than the increasing rate of maximum temperature. The results also reveal that the relative humidity and precipitation are increasing too. Since the heat island increases the number of atmospheric contaminants and since this phenomenon affects the formation rate of surface ozone more than other contaminative elements, the variation of locale ozone was studied. The findings indicate an increase in the amount of surface ozone.

Keywords