Question: In what way does pollution affect in humans?

Lauren Laing answered on 11 Mar 2016:

This will depend on the pollutant, all chemicals work in different ways.
Your body is maintained in a healthy state by complex, but essential processes. Some chemicals interact with these pathways, upsetting their balance and so affecting your health. How poisonous a chemical is depends on many things, this can include how it gets into your body: through your skin? Directly into an open wound? Inhalation? Through the mouth when you eat or drink?
How poisonous a chemical is also depends on the amount of the chemical entering your body, some chemicals are good for you in small doses, but bad for you in very high doses. Also, the rate at which your body can remove the chemical will affect how poisonous it is. Some chemicals are designed to be poisonous, such as pesticides, but many of these are now designed to not affect humans, and to only kill the insect or pest they are designed to kill. Other chemicals can be bad for you, but are not man made, they may be natural. Examples include the chemicals some bad bacteria produce which may cause you to feel ill.