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WHAT IS AIR POLLUTION?

Air pollution is the effect caused by concentrations of solids, liquids or gases in the air that have a negative
impact on the surrounding environment and people. There are many pollutants and they may occur naturally (from
dust, wildfires and volcanoes) or from human activity, be visible or invisible, emit an odor or be odorless. Various air
pollutants can stay in the atmosphere from minutes to years and, while often considered a local issue, may have a
range that is local, national, regional or global. Air pollution is often understood as an urban issue and it is true that
cities concentrate economic activity and demand for energy services, and, so, tend to experience the most harmful
concentrations of air pollution. The precise mix of pollutants and the severity of the health impacts are different from
Paris to Delhi, Los Angeles to Lagos, Beijing to Mexico City, but all have air quality that reduces life expectancy. Air
pollution does not stop at the city gate: the sources are widespread, sometimes rural in nature and, although some
pollutants disperse only locally, others travel large distances in the atmosphere and have regional and global impacts.
Many of the world’s poorest communities are heavily exposed to toxic fumes when cooking, or heating and lighting
their homes.