Define air pollution mention it's causes …

Air pollution is defined as the introduction of pollutants, organic molecules, or other unsafe materials into Earth’s atmosphere. This can be in the form of excessive gases like carbon dioxide and other vapours that cannot be effectively removed through natural cycles, such as the carbon cycle or the nitrogen cycle.
Causes of Air Pollution

Air pollution can be caused by both man-made and natural causes, although the contribution by these natural causes is pretty negligible.

The main culprit of air pollution is the man-made sources of air pollution. The single most harmful source of air pollution is the unchecked burning of fossil fuels by mankind. Fossil fuels (non-renewable sources of energy such as crude oil, petrol, diesel, coal etc.) are used in almost every process of industrialization, manufacturing, transport and energy generation

Prevention

1. Use of Energy efficient appliances: Whether at the domestic level or at the industrial level, we must push for appliances that use energy efficiently, which result in complete combustion of fuel, as incomplete combustion causes air pollution.
2. Shifting industries: Another possible solution to reduce the harmful effects of air pollution is to shift the manufacturing plants, factories and industries to remote areas with a low level of population. By doing so you can ensure that pollution in the urban areas decreases over time.
3. Using Modern Techniques: With technology making great advancements, there are now technologies available that can help reduce the release of pollutants in the air. Air filters, scrubbers, precipitators are just a few examples.
4. Shifting to Natural Gasses: Instead of using and exhausting fossil fuels, shifting to greener options is a no-brainer. For example, using CNG (compressed natural gas) instead of petrol or diesel is a great option.