A chemical attack is the deliberate release of a toxic gas, liquid, or solid that can poison people and the environment. Possible signs of a chemical attack are: 

• Many people suffering from watery eyes, twitching, choking, having trouble breathing or losing coordination.
• Many sick or dead birds, fish, or other small animals are also a cause for suspicion.

If you observe signs of a chemical attack: Find clean air quickly. 

Chemical Threat Visual Guide

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Source: Ready.gov

• Immediately try to define the impacted area or where the chemical is coming from, if possible.
• Take immediate action to get away.
• If the chemical is inside a building where you are, evacuate the building immediately without passing through the contaminated area, if possible.
• If you are unable to evacuate the building or find clean air without passing through the contaminated area, it may be better to move as far away as possible and “shelter-in-place.”
• If you are outside, quickly decide what is the fastest way to find clean, uncontaminated air. Consider if you can evacuate the area or if your should go inside a nearby building and “shelter-in-place.” 

If you think you have been exposed to a chemical: 

If your eyes are watering, your skin is stinging, and you are having trouble breathing, you may have been exposed to a chemical.  

• If you think you may have been exposed to a chemical, strip immediately and wash.
• Look for a hose, fountain, or any source of water, and wash with soap if possible, being sure not to scrub the chemical into your skin.
• Seek emergency medical attention.

Source: http://www.ready.gov