It is created when pollutants emitted by cars, power plants, industrial boilers, refineries, and other sources chemically react in the presence of sunlight. Ozone, an atmospheric gas, is often called smog when at ground level. Traffic-Related Air Pollution (TRAP), a mixture of gasses and particles, has most of the elements of human-made air pollution: ground-level ozone, various forms of carbon, nitrogen oxides, sulfur oxides, volatile organic compounds, polycyclic aromatic hydrocarbons, and fine particulate matter. Nature releases hazardous substances into the air, such as smoke from wildfires, which are often caused by people ash and gases from volcanic eruptions and gases, like methane, which are emitted from decomposing organic matter in soils. Vehicle emissions, fuel oils and natural gas to heat homes, by-products of manufacturing and power generation, particularly coal-fueled power plants, and fumes from chemical production are the primary sources of human-made air pollution. What Is Air Pollution?Īir pollution is a mix of hazardous substances from both human-made and natural sources. Air pollution, in all forms, is responsible for more than 6.5 million deaths each year globally, a number that has increased over the past two decades. It is a major threat to global health and prosperity. Some air pollution is not seen, but its pungent smell alerts you. We know what we’re looking at when brown haze settles over a city, exhaust billows across a busy highway, or a plume rises from a smokestack. Air pollution is a familiar environmental health hazard.
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