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Fact #1. The concept of using respiratory equipment to protect one's self from the dangers of pollution and toxic gases was originally pioneered as early as the first century CE. Roman mine workers used animal bladder skins to avoid inhaling lead oxide dust. By the 16th century, Leonardo da Vinci suggested that a finely-woven cloth dipped in water could protect sailors from a toxic powder weapon he had created.
Fact #2. Following World War One, the military took a large interest in the use of respirator technology to defend against chemical warfare. This resulted in the development of inexpensive filters made from resin-infused dust by the 1930s. Modern units are designed with more sophisticated materials than their pre-war counterparts. However, their fundamental operation remains the same with a focus on maintaining both worker and civilian health.
Fact #3. Regardless of whether you're a fireman, construction worker, or medical professional, chances are you're constantly being exposed to airborne contaminants. This can include dust, debris, harmful gases, and even viruses. These types of situations provide the perfect opportunity to use a respirator.
Fact #4. In most situations, a respirator is going to be used as a preventive or protective tool and not necessarily something you're going to wear for fun. So, don't just start running around and pretending to be Darth Vader. You need to know what you're doing and which model will work best for your situation to keep you safe.
Fact #5. While this might be a no-brainer, ensuring that your unit fits properly and doesn't obstruct your view when wearing it will be an important consideration. If you're a firefighter, for example, a purified-air model would do you little good if you can't see where you're going when trying to extinguish flames.