Although people like to joke with careless sayings such as "When the second count, the police are just minutes away", there is some truth to it in cases of fire, biohazard incidents, chemical spills, or an accidental release of toxic gases.
When the alarm goes off sounding that an accident has happened in your area or smoke begins to enter your workspace, there may not be time to get to an Emergency PPE Equipment Station. Worse yet, the emergency may already be between you, the station, and the only exit out of the building.
You can navigate this site if you want to buy PPE equipment.
When that happens, the best, immediate protection you have is going to be the Personal Escape Mask that can be carried around your neck, in a purse, or store in a desk drawer. Ideally, it's going to need to meet the OSHA standards for Air Purifying Escape Respirators (APERs) and be light enough to comfortably wear in what is going to be a hostile environment while you are trying to get out with your life.
APERS standards were developed to ensure a set of requirements for all manufacturers to follow and that the buyer of the company to the individual easily could understand. Among the criteria that must be met APERS in the field of view, resistance to fogging, chemical permeation, functional design, ease of wear, and shelf life. This becomes especially important after the 9/11 attacks when private businesses started looking for protective equipment for their employees can easily and safely use with little to no training.