Q: What are two basic types of pollutants in the air?


Read this paragraph and choose the correct option from the provided answers:

There are two basic types of pollutants in air. They are known as primary pollutants and secondary pollutants.

 Choices:

- smog and coal

- organic and inorganic

- pesticides and smog

- primary and secondary pollutants


A:
primary and secondary pollutants