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Decided to do some research on chemical weapons since I have been hearing about what to do, but not how they work and how long do they last in where they landed.

 So this is what I found out:

• Chemical attacks are vapor based and disperse quickly with wind and warm weather.
• You can leave the area where it landed.
• Since it is heavier it is safer to be someplace that is not underground, since it will collect there.
• Make sure you have top cover to keep the chemicals from coming to you
• Your best protection is fresh air and staying calm.
• The more you inhale in, the more potent and powerful it becomes.

 If you start experiencing these symptoms:

• Sudden headache,
• Dimness of vision (someone you're looking at will have pinpointed pupils),
• Runny nose,
• Excessive saliva or drooling,
• Difficulty breathing,
• Tightness in chest,
• Nausea,
• Stomach cramps,
• Twitching of exposed skin where a liquid just got on you.

 Ask yourself did you hear any loud noises or pops; are other people reacting the same way. Is there an odor of new mown hay, green corn, something fruity, or camphor?

 If this is yes. Then CALMLY, if you panic you breathe in more of the chemical and it reacts faster.  So leave the area and head up wind from the place.

 FRESH AIR is the best "right now antidote". If you have a blob of liquid that looks like molasses or syrup on you; blot it or scrape it off and away from yourself with anything disposable.

 Remember the agents have to do all the work, they have to get the concentration up and keep it up for several minutes while all you have to do is quit getting it on you and quit breathing it by putting space between you and the attack. Blood agents are cyanide or arsine which affects your blood's ability to provide oxygen to your tissue.

 
Different type of agents:

• Nerve Agents (g-agents, v-agents) have a persistence of 15 minutes to 1 week in a warm environment; they have a very quick rate of action and enter the body through the eyes and lungs for aerosols and eyes, skin and mouth for liquids.
• Choking Agents (cg, dp) persist for 1 to 10 minutes in a warm environment with an immediate rate of action using the lungs and eyes as the entrance. Blister Agents (hd, hn, l, cx) have a persistence time of 3 days to several weeks. Rate of action varies from slow to very quick death depending on the exact type of agent used, which the survivor will most likely not be able to ascertain. These agents affect the eyes, skin, lungs and mouth.
• Blood Agents (ac, ck) persist from 1 minute to 15 minutes in a warm environment and have a very quick rate of action acting primarily on the lungs, eyes and injured skin.

 Sources:

• http://www.arcaini.com/America/TheRealDeal.htm
• http://www.jrhenterprises.com/report/chem1.htm