Pollution 

Any activity carried out  put by human beings which harms the environment is known pollution. The substrate or gases which cause pollution are called pollutants. 

   Typer of pollution 

    1* Air pollution.

     2* water pollution 

     3* Noise pollution.            4* soil pollution.

Natural and humans cause air pollution. Nature pollution the air by sandstorms forest fires eruption of volcanoes and pollens from flowers. However most air pollution is caused by human activities. Burning of fuels is factories and vehicles burning of garbage, release of smoke and harmful gases into the atmosphere are the activities that cause air pollution.