An integrated method to valuate the function of green roofs in absorbing air pollutants; Case study: Tehran

Tehran is the capital city of iran and its inhabitants are suffering from air pollution. green roofs can be one of the choices to deal with this problem. in this paper, ability of green roofs in absorbing four air pollutants (pm10, so2, no2, and co2) in tehran was valuated. first, the potential of 1 m2 of a hypothetical green roof in tehran in absorbing pm10 and so2 during 1 year was estimated using a dry deposition model. absorbing potential of green roof for no2 and co2 was taken from other studies. next, the reduction of each air pollutant was valuated using replacement cost method. then, results were generalized to the total roof areas of the residential buildings in tehran for the green roofs life span. estimations showed that value of green roofs covering an area of 94,093,625 m2 in reducing pm10, so2, no2, and co2 during 50 years in tehran will be 506,361,775 $.