I was diagnosed with COPD and asthma many years ago, I also have problems with fragrances but even allergies to environmental toxins. On days when the air is heavy with moisture I’ll feel my chest get tight and then the coughing starts, too much dust will also do the trick, sometimes I will react to something unknown and there’s no obvious smell to determine what it is. I find that wearing my mask outside is fairly helpful but definitely not perfect.