Other than high levels of Pollution, different irritants and chemicals can be the basis for asthmatic symptoms and indications to appear. Airborne allergens, such as pollen, dust mites, mould spores, pet dander, or cockroach faeces, can be asthma triggers and vary from person to person. Himalayan Siddha Akshar, Yoga Guru, Founder, Akshar Yoga Institutions suggests a few breathing exercises to curb the impact of pollution and smog.

Brahmari Pranayama Technique (Humming Bee Breath)

Surya Nadi Shodhan

Chandra Nadi Shodhan

Bhastrika Pranayama (Bellow Breath)

Kapal Bhati (Skull Shining Technique)

https://timesofindia.indiatimes.com/life-style/health-fitness/health-news/breathing-exercises-for-patients-with-asthma-and-breathing-problems/photostory/95431655.cms