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Even today, in a world increasingly powered by renewable energy and clean technologies, air pollution poses a real risk to human health. In the UK alone, it is estimated to be responsible for 28,000 to 36,000 deaths every year, and can vastly increase the risk of developing many lung and heart-related diseases, such as asthma or lung cancer.
Polluted air forms a complex mixture that changes depending on where the pollution is coming from, and what the local weather is doing at the time. People in towns and cities are more at risk since they live closer to most cars, factories and other sources of emissions.