[9] Subsequently, he enrolled for doctoral studies at Physical Research Laboratory and after securing a PhD in atmospheric physics in 1990, he did his post-doctoral studies at National Center for Atmospheric Research.
His stay at NPL lasted only 5 months and in July 1996, he joined (IITM) as a scientist (Grade-C).
Over the years, he rose through ranks to hold the position of a scientist (Grade-G) and also heads the System of Air Quality Forecasting and Research (SAFAR) programme as its director.
[11][note 2] The World Meteorological Organization selected him for the Norbert Gerbier-Mumm International Award in 2005, making him the first Indian recipient of the honor.
[2][7] The Council of Scientific and Industrial Research awarded him the Shanti Swarup Bhatnagar Prize, one of the highest Indian science awards in 2006[12] and three years later, the Indian Academy of Sciences elected him as their fellow.