Question

how fog is dangerous for asthma patient

Answer 1

Answer:

In people with asthma and airways hyper-reactivity, the irritant effect of short term exposure to water-based fog machines - particularly when the chemical glycol is used - could trigger acute asthma symptoms including cough, wheeze, chest tightness and shortness of breath.

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Answer 2

Answer:

Stanley Goldstein, a representative of the American Academy of Allergy, Asthma & Immunology, told Reuters Health that people with asthma have "airways that are hyper-reactive, which means they are sensitive to irritants in the environment that are breathed in, and fog and mist are definitely irritants.