Dr Kirpa is an Assistant Professor at the Institute of Environment and Sustainable Development, Banaras Hindu University, India. He earned his PhD degree (Atmospheric Chemistry) in 2010 from Physical Research Laboratory (PRL). His research interest is Atmospheric Chemistry and Aerosols, Climate change, carbonaceous aerosols: Measurements of organic and elemental carbon, water-soluble organic carbon and air-quality studies, optical properties of aerosols.