The AirQ software has been used by other investigators to assess the human health impact of PM2.5 or PM10. estimated the human health risk in relation to air quality in two municipalities in an industrialized area of Northern Italy, the authors found that PM2.5 had the highest health impact on the 24,000 inhabitants of the two small towns, causing an excess of total mortality of 8 out of 177 in a year; also Ozone and nitrogen dioxide each caused about three excess cases of total mortality. focused on short-term effects of PM10 in Trieste (about 200,000 inhabitants), a city in north-east Italy; For PM10 concentrations above 20 μg/m3, 52, 28 and 6 cases in excess, respectively, were estimated for total, cardiovascular and respiratory mortality. These figures, if normalized to the population in Tehran (8,700,000 inhabitants), would result in a number of excess cases very similar to those reported for PM10 in Table 2.