This program gives viewers a thorough overview of air pollution, climate change, and the resulting impact on human health. The study of air pollution began in 1952 with The London Fog, a severe air pollution event primarily arising from the use of coal. For five days, the city of London was brought to a standstill by a dense blanket of toxic smog, killing an estimated 8,000 to 12,000 people. This event spurred action by governments and researchers to minimize air pollution and to protect health. Dr. Scott Weichenthal, associate professor of Epidemiology, Biostatistics, and Occupational Health at McGill University, discusses how a variety of contaminants such as volatile organic compounds, sulfur dioxide, carbon monoxide, nitrous oxide, and particulate matter can impact human health.