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The aerosol is a term used to describe a collection of airborne solid or liquid particles with a typical size between 0.01 and 10 μm that reside in the atmosphere from periods of hours to days or months. They may be natural or anthropogenic in origin. Examples of aerosols include pollutants, smoke, haze. These particles mostly have a small diameter (less than one micrometre or micron= 0. 0001mm, the symbol is used by the international bureau of weight and measures) and therefore, are very unhealthy for most animals and humans due to our ability to filter these particles normally without any mask.

In addition, aerosols cause increased global warming effect such as flooding, Most often aerosol is in general conversation talked about as a spray (aerosols) on a can or similar container. Other commercial products in the same category of technical applications include medical treatment of respiratory illness and pesticides. In many other technological products, the removal of aerosol has been replaced with less or non-polluting other green chemicals. See Particulate matter (PM) and Atmosphere.

The impact of aerosols on air pollution problems:

  • local air pollution
    • reduce visibility
    • effect on human health
  • regional air pollution
    • contribute to acid deposition, affecting forest and lakes
    • contribute to eutrophication, affecting water quality
    • influence photochemistry & ozone production
  • global air pollution
    • reflect solar light & hence influence climate change
    • change the reflectivity of clouds, impact on climate change
    • catalyse stratospheric ozone loss/ Antarctic ozone hole

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