Which chemical is used in fire extinguishers? How is it harmful?

The dry chemical is potassium bicarbonate or sodium bicarbonate. 

They are harmful if inhaled.

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Fire extinguishers contain different chemicals, depending on the application. Handheld extinguishers, which are commonly sold at hardware stores for use in the kitchen or garage, are pressurized withnitrogen or carbon dioxide (CO2) to propel a stream of fire-squelching agent to the fire.
   
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    Potassium bi carbonate or sodium bicarbonate is sued in fire extinguisher.
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    Fire extinguishers contain different chemicals, depending on the application. Handheld extinguishers, which are commonly sold at hardware stores for use in the kitchen or garage, are pressurized with nitrogen or carbon dioxide(CO2) to propel a stream of fire-squelching agent to the fire. The active material may be a powder such as potassium bicarbonate (KHCO3), liquid water, an evaporating fluorocarbon or the propelling agent itself. The most effective and common fluorocarbon used until recently for this application had been bromo chlorodi fluoro methane (CF2ClBr), referred to as halon 1211. By international agreement, however, production of all types of halons ceased in 1994 because the bromine and chlorine atoms in the chemical were found to migrate over time to the stratosphere, where they react to deplete ozone in a very efficient catalytic cycle.


     
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    cfcs or chloroflouro carbons are used in fire extinguishers and even co2 is found fire extinguishers
    cfcs deplete the ozone layer which protects the earth from ultraviolet radiations of the sun and co2 are gases the contribute green house gases
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    Fire Extinguishers produce CFC's (chloroflouorocarbons) , contains carbon , fluorine , chlorine. Chlorine present in CFC's destroys a large number of Ozone molecules present in the ozone layer. This is due to a few reasons why ozone hole is prominent over the Antarctic region.
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    cfcs.... co2...
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