Gas filters and masks are used to guard the human body against the harmful effects of biological and chemical agents. Many chemicals like chlorine, hydrogen cyanide, phosgene, mustard agent, and many others were used during World War I.

These caused a number of casualties among allied forces and created the need for protective masks. You can get to know about face protection masks via

face protection mask

Ever since then gas masks have evolved and protected against all sorts of known chemical and biological agents. Gas masks use various techniques to guard the user. The most basic mask employs the filtration system.

Pollutants generally have larger particles than oxygen and also by using a fine mesh these can be kept out. The only drawback is that atmosphere supply can be restricted in this procedure. The different process utilizes the absorbing qualities of certain chemicals such as activated charcoal to control the harmful agents. 

Such sprays possess limited use since they have the ability to absorb just several chemicals. The present-day sprays make use of the technique of compound neutralization.

These masks comprise chemical filters that neutralize the harmful chemicals found in the air. Some of them have tubes for drinking water, communication systems, and winterization kits to reduce fogging during cold-weather states.

These masks offer sufficient protection only to the facial skin and organs. Chemicals have already been developed which affect the skin and could possibly be utilized in future terror attacks and war zones. A protective bodysuit attached to the mask can be just a good choice to counter the harmful effects of such chemicals.