The problem is that with sarin nerve gas all you need is one pin head-size drop on your skin and you're dead. I know, everyone thinks it is a gas because the burster charge in the bomb/shell that is carrying the agent vaporizes it but you get thousands of micro droplets.NIOSH-Approved N95 Disposable Particulate Respirators
Sure if you inhale a droplet you die faster but a droplet on your skin can be just as deadly ... it may take a few hours to kill you. That is why the military has MOPP suits.
From Wikipedia, the free encyclopedia
MOPP (Mission Oriented Protective Posture)(acronym pronounced as "mop") is a protective gear used by military personnel in a toxic environment, e.g., during a chemical, biological, radiological, or nuclear (CBRN) strike:
Mask carrier Protects the mask from damage. It is usually worn as part of battle gear for easy access and usually contains a technical manual, extra filter, spare parts, chemical detection papers, and nerve agent antidote kits (NAAK).
Protective mask Commonly referred to as a gas mask or pro mask. It is designed to filter harmful chemical and biological agents, as well as irradiated particles from the air to allow the wearer to breathe safely. No protective masks filter out gasses such as carbon monoxide, and in situations requiring that level of protection, external breathing apparatus is employed.
Over garments Joint Service Lightweight Integrated Suit Technology (JSLIST) Specially designed clothing to be worn over the normal uniform. These garments are designed to allow maximum airflow for cooling while keeping chemical and biological agents from reaching the skin of the wearer. Some are equipped with a charcoal lining to neutralize some agents. Military personnel often equip over garments with strips of M9 Detector Paper to identify chemical agents on the battlefield they might come in contact with.
Gloves and overboots (JSLIST) Highly durable rubber, designed with combat operations in mind. Used to prevent contact with agents.