Can you develop asthma in your 30s?

Ever since I moved to a new city about 5 years ago, my allergies and any colds I get have begun to turn into chest congestion that makes it difficult to breath. Twice I have ended up at urgent care and gotten shots, nebulizers, and inhalers. I’m not looking for an actual diagnosis of course, more thoughts in a general nature on the topic, but I wonder if I could be developing asthma, and if the higher air pollution of my new town could be the cause. Any thoughts?