If the data for all cities are aggregated, the figures show that the largest contributor to PM2.5 -related mortality is residential emissions, with a mean of 22.7% of total mortality. In second place is the agricultural sector, which accounts for 18% of PPM2.5 mortality, followed by industry (13.8%), transport (13.5%), the energy sector (10%), natural sources (8.8%) and maritime transport (5.5%).