COPD increase

So i just got discharged for COPD increaasement and bronchospasms. Nothing new, i had pneumonia for 8 days like 3 weeks ago.

I wanted to know what triggers do many of you notice TRIGGER chest tightness?

Im going to be making an appointment with an Allergy Doc to see what is causing these flare-ups. I was hoping maybe some of you would help? Maybe give me some insight on what to avoid and such.