Adult Acne..

I started to get a lot of black heads and some on the larger size on my cheeks that started not too long ago. I thought was because of my job I started 2yrs ago. The environment is a lot dirtier with more dust particles and pollen, but I'm older now. I have always had clear skin I would even get comments on how clear my skin was. But now! I have cheek break outside constantly. Meanly blacks heads. Is it age, is it my job? Is there something I can do the stop them they are SOOO IRRITATING since I've never had this problem. When my husband politely makes comments about them I know it's an issue.