National mean of Particulate matters 10 concentration shows fluctuating trend exceeding the NAAQS (Figure 9.2c). The reasons being emission from gensets, small scale industries, biomass incineration, suspension of traffic dust, natural dust, commercial and domestic use of fuel and vehicular emission etc. Furthermore, the increasing trend for Particulate matters 10 may be attributed to the increasing number of vehicles and re-suspension of natural dust.