Readers of international news will likely have become aware of serious air quality problems in northern China. So I was not surprised (but neither was I happy) to receive an email from two martial arts teachers in China. They mentioned that they were seeing substantially more students with breathing problems.
Normally (as much as that term applies to my teaching) the progression in teaching Wujishi breathing exercises has the two Pure Yang Bodhisattva postures taught later (5th and 6th). The advice was if I had students with asthma to teach these stances earlier.
Plowing through the human genome databases looking for asthma we have (note the hotspot on chromosome 5)