Know how to protect themselves from the initial pollution is to avoid going in, there are sources of pollution if they need to go in a place where there is pollution and hygiene should be masked back should clean the body.
Know how to protect yourself from this pollution. Is to avoid the sources of pollution. If you need to go in a place where there should be a pollution mask. Should be cleaned and returned to the body.
Know how to protect themselves primarily from pollution. Is to avoid in the source of pollution. If you need to go in a place where the pollution should wear a mask. And come back to clean the body.