Project Summary/Abstract Environmental exposures are major contributors to illness and premature death in countries around the world. Air pollution is especially concerning as it promotes chronic cardiometabolic disease and can trigger acute cardiac events. In rapidly urbanizing India, an estimated 1.67 million deaths per year are attributed to air pollution, making it a factor in nearly 18% of total deaths and 11.5% of total disability adjusted life years. While the link between air pollution and ill health is becoming clearer, we need to learn more how the components of air pollution interact with each other and with other elements of the exposome such as heat, to affect health This is especially important in LMIC cities, where industry and traffic generate pollution and climate change is causing unprecedented heat waves. We also need to identify sensitive ages where air pollution exposure can be particularly detrimental. Children pass through critical windows of development when they are highly sensitive to exposures. Older adults are more likely to experience cardiac events when air pollution and heat levels rise. In addition, exposures differ for people of different ages, gender, occupations, and socioeconomic status. To address this complex situation, India needs experts trained in environmental health to carry out research and recommend effective policies to mitigate air pollution exposure and protect those most vulnerable to its effects. In this proposed project, entitled, “2/2-GEOHealth Health Effects of Selected Environmental Exposomes Across the Life CourSe (HEALS)-US,” our multidisciplinary team of researchers, mentors and faculty from the Harvard T.H. Chan School of Public Health (HSPH) and the Centre for Chronic Disease Control (CCDC) will build on knowledge gained in our original GEOHealth project in which trainees and mentors developed models to estimate levels of ambient PM2.5 in Indian cities and quantified the links between air pollution exposure and cardiometabolic disease and death in Delhi. In addition, three students earned master’s degrees from HSPH and one earned a Doctor of Public Health (DrPH). The proposed project will focus on training early career faculty and researchers and recent post-docs in designing a research study, writing up a proposal, and carrying out research on topics related to the research aims of characterizing the exposome and identifying groups most vulnerable to the effects of air pollution. Two additional DrPH students will also be trained. The project will be led by Dr.Sieber and Dr.Schwartz from HSPH and by Dr. Prabhakaran of CCDC and Dr. Reddy of the Public Health Foundation of India who will be assisted by the: 1) Administrative Oversight Committee; 2) Training Oversight Committee; 3) Program coordination personnel at HSPH and CCDC; and 4) Supervisory teams to provide oversight for individual trainees. Evidence from the research conducted under the linked U01 will directly inform Indian governm...