For people with asthma, which metro was easier for your breathing? Phoenix, AZ, Houston, TX, or Dallas-Fort Worth, TX?

For me, I would have to say the DFW metroplex has been the best for my daily breathing and asthma. Had problems breathing a lot in Phoenix, was always short of breath. In Houston, it was a tad bit better than Phoenix, but not much. I always feel like im about to get sick in Houston for some reason and get so many headaches there.

Just curious to hear from you all that have asthma, which metro has been the best for you.