Aerosol chemistry is important in studies related to radiative forcing, air quality, climate change etc. Chemical composition of precipitation reflects the chemical status of the atmosphere. These studies are needed to understand the deposition fluxes, biogeochemical cycles of important nutrients i.e., N and S. The effects of acid rain on forests, soils, lakes and monuments will be presented. The collection and analysis of precipitation, ionic composition of precipitation in different environments will be presented. The non-sea salt components, neutralization factors of various ions will be explained. Source identification of various ions will be presented. Long term trends in precipitation chemistry will be shown. The collection and analyses of aerosols and the aerosols chemistry in different environments will be shown.