Alguien duro para química ?

Use examples from the article to explain one positive and one negative effect that chemistry has had on society

Ab c or d ? i’m not sure what the answer is

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.