Rain water and dustfall deposition samples were collected at Pune, an urban
site (1992-98) and at Sinhagad, a rural site (1992-94). The samples were c
ollected with wet-only and bulk collectors at Pune and with bulk collector
at Sinhagad. The samples were analyzed for major ions, pH and conductivity.
The study showed that the rain water at both places is alkaline (pH > 5.6)
. The average pH at Pune was 6.1. Neutralising components, indicated by Ca
and non sea salt (nss) Mg have higher concentrations than the acidifying co
mponents SO4 and NO3. The wet deposition fluxes of all the ionic components
were higher than the dustfall fluxes. Relative contribution from dustfall
was largest for K, Ca, Mg and NO3. Dustfall was greater at Pune, compared t
o Sinhagad for all components and up to double for Ca.