02680nas a2200325   4500000000100000000000100001008004100002653001600043653001700059653000700076653001400083653001400097653001000111653002400121653003200145653001300177100002200190700001700212700001600229700001800245700001800263700001700281700001500298245010400313856007200417300001200489490000700501520183200508022001402340       2019                            d10aAir quality10aParticulates10aPM10aBengaluru10aBangalore10aIndia10aEmissions inventory10aChemical transport modeling10aWRF-CAMx1 aSarath Guttikunda1 aK.A. Nishadh1 aSudhir Gota1 aPratima Singh1 aArijit Chanda1 aPuja Jawahar1 aJai Asundi00aAir quality, emissions, and source contributions analysis for the Greater Bengaluru region of India  uhttps://www.sciencedirect.com/science/article/pii/S1309104218304835  a941-9530 v103 aBengaluru - capital of the state of Karnataka is the original “Silicon Valley” of India. In this paper, we present a comprehensive snapshot of the state of air quality in Bengaluru, along with an emissions inventory for the pollutants necessary for chemical transport modeling at 0.01° grid resolution (approximately 1-km), for an urban airshed covering 60 × 60 grids (4300 km2). For 2015, emission estimates for the city are 31,300 tons of PM2.5, 67,100 tons of PM10, 5300 tons of SO2, 56,900 tons of NOx, 335,550 tons of CO, and 83,500 tons of NMVOCs. Overall, transport is the key emission source for Bengaluru - vehicle exhaust and on-road dust resuspension account for a combined 56% and 70% of total PM2.5 and PM10 emissions; followed by industries (17.8% including the brick kilns), open waste burning (11.0%), and domestic cooking, heating, and lighting (6.5%), in case of PM2.5. We conducted particulate pollution source apportionment of local and non-local sources, using WRF meteorological model and CAMx chemical transport modeling system. A comparison of range of 24-hr average modeled PM2.5 concentrations (36.5 ± 9.0 μg/m3) and monitored PM2.5 concentrations (32.3 ± 24.2 μg/m3) by month, shows that the model catches the quantitative ranges and qualitative trends. The modeled source contributions highlight the vehicle exhaust (28%) and dust (including on-road resuspended dust and construction activities) (23%), and open waste burning (14%), as the key air pollution sources. Unless there is an aggressive strategy to improve urban planning and public transport options, pollutant emissions under the business as usual scenario are expected to increase at least 50% in 2030 and doubling the urban area with PM2.5 annual averages above the national ambient standard of 40 μg/m3.  a1309-1042