Major sources include vehicle emissions, industrial discharges, burning of fossil fuels, agricultural activities, and natural events like wildfires and volcanic eruptions.
Common air pollutants include particulate matter (PM2.5 and PM10), nitrogen oxides (NOx), sulfur dioxide (SO₂), carbon monoxide (CO), volatile organic compounds (VOCs), and ozone (O₃).
Smog is a type of intense air pollution characterized by a mixture of smoke and fog. It forms when pollutants like nitrogen oxides and volatile organic compounds react in the presence of sunlight, creating ground-level ozone and particulate matter.
Acid rain occurs when sulfur dioxide (SO₂) and nitrogen oxides (NOx) emissions react with water vapor in the atmosphere to form sulfuric and nitric acids. These acids precipitate as rain, snow, or fog, leading to environmental damage.
Air pollution can lead to environmental issues such as acid rain, eutrophication, depletion of the ozone layer, and climate change due to increased greenhouse gases.
The Air Quality Index (AQI) is a numerical scale used to communicate how polluted the air currently is or how polluted it is forecast to become. It helps the public understand air quality levels and associated health risks.
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