Air Pollution

Air supplies us with oxygen which is essential for our bodies to live. Air
is 99.9% nitrogen, oxygen, water vapour and some other gases. Human
activities can release substances into the air, some of which can cause
problems for humans, plants, and animals.
There are several main types of pollution and their many effects are
causing big problems in our world. These include smog, acid rain, the
greenhouse effect, and "holes" in the ozone layer. Each of these
problems has serious implications for our health and well-being as well
as for the whole environment.