I've corrected a few basic errors and pointed out a couple of areas you may wish to amend. It would also work better as two or three paragraphs.
"Air pollution has two main effects that directly affect our lives. ('effects that affect' is poor style, perhaps you should re-write this part).
First of all, it causes many natural disasters. For example, the
destruction of ozone layer. Because of some air pollutants like CFCs,
the ozone layer is 50% thinner than normal in Antartica. This "hole" in the
ozone layer lets solar Ultraviolet (UV) through, which may have led to
an increase in skin cancer. Another disaster that we have suffered is that of
the greenhouse effect. The greenhouse effect may make the temperature
of the Earth higher sothat the ice at the two poles will melt rapidly
and the level of coastal water will certainly rise. Moreover, air
pollution may have many direct effects on people 's health.For
instance, the increasing percentage of Carbondioxide (CO2) in the air
makes people feel not fresh (fresh not a good word here) and not healthy.Besides, some poison gases
may cause irritation of the eyes or coughing. In conclusion, there are
two effects of air pollution that people should care about : the natural disasters and the damage to people's health. "