The most common material used dry chemical fire extinguishers is ammonium phosphate (with some ammonium sulfate). These agents can cause health effects associated with inhalation and include upper respiratory irritation with such symptoms as coughing or discomfort in the chest.
Proper use of fire extinguishers is generally safe; however, there is some risk for mild respiratory, skin, or eye irritation. Breathing in fire extinguishing powder can produce serious toxicity and would require medical evaluation.
Is it Bad to Inhale Fire Extinguisher Residue Dust?
The dry chemical powder in standard ABC class fire extinguishers and others will irritate the respiratory system if it is inhaled making breathing difficult. Before you go calling an extremely expensive cleaning crew to come in and clean up the extinguishing powder, it would be helpful to know what type of fire extinguisher was used to extinguish the fire and what personal …
Nasal irritation and throat irritation such as a cough or discomfort in the chest are the result of breathing the powder or the dust. Those with medical conditions such as asthma may experience respiratory difficulty after exposure to dry compounds in fire extinguishers.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher