A teacher lost the label on the elements they were going to use in a lab; would placing the elements in water, be a good way to figure out what the element 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.