Air pollution occurs in different ways. Some of the causes are given below:
$\bullet$ Stone crushers give rise to a substantial quantity of dust emissions which creates health hazards.
$\bullet$ Municipal solid waste which is burned, adds particulate pollution to the air.
$\bullet$ Power plant industries also contribute to more than 40% of the population.
$\bullet$ Volcanic eruption is a natural phenomenon without human interference. It also releases large quantities of greenhouse gases and other pollutants.