Each of our breaths carries toxins from polluted air into the lungs, but the amount of toxins that blood absorbs from the lungs is very small.
The discharge of chemicals into rivers and oceans or oil spills in the sea causes long-term consequences for humans and the habitats of many aquatic species.
Analysis of the Chinese Academy of Sciences showed that the smog that struck Beijing and its northern provinces last month contained a large amount of toxic chemicals.
Being able to fire fiercely in the air, white phosphorus can cause serious injury if it gets on the skin.