The air in this room is very fresh.

What is this material made of?

The pollution in this area has become a serious problem.

He is a 'big friend', an adult fan of that anime.

Don't take his joke seriously.

His words had a great influence.

That decision had a bad effect on our project.

I will participate in the factory coop next week.

My father works at a paper mill.

My father works at a filature.