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Asbestos is a proven human carcinogen, and all forms of asbestos can cause cancer – Ministry of Health. Asbestos was widely used in commercial and

Filters need to be changed regularly to continue to maintain protection levels. Breathing resistance increases as particulate filters fill up. If you’re turning blue, it

Respiratory filter types used as part of an “Air Purifying Respiratory System” should only be used when there is at least 19.5% oxygen in the

The first effective filtering activated charcoal gas mask in the world was invented in 1915 by Russian chemist Nikolay Zelinsky (I wonder if he’s related