CHAIR India (Consortium for Climate, Health & Air Pollution Research in India) research group, a global collaboration for air pollution and climate research across India. The work is led and coordinated centrally through the Institute of Environmental Medicine, Karolinska Institute, Stockholm, Sweden (PI Petter Ljungman) in close collaboration with the Centre for Chronic Disease Control, Delhi, India (PI Dorairaj Prabhakaran), Centre for Health Analytics Research and Trends, Trivedi School of Biosciences, Ashoka University (PI Poornima Prabhakaran) and Department of Environmental Health, Harvard T H Chan School of Public Health (PI Joel Schwartz).