Air pollution and health Introduction: The human health effects of poor air quality are reaching, but principally affect the body's respiratory system.
All about Respiratory System Leonardo, Andy, Marilu, Elizabeth.
Environment day
Air pollution by gaurav jha
How much do you know about earth ？ Age : 4.6 billion years Surface area : 5,96million sq.km Atmosphere structure : 77% ： nitrogen ; 21% ： oxygen ; 2%
