STAY CALM. Panicking increases the irritation. Breathe slowly and remember it is only temporary.
If you see it coming or get a warning (e.g. police are putting gasmasks on), put on protective gear. If able, try to move away or get upwind.
Blow your nose, rinse your mouth, cough and spit. Try not to swallow.
If you wear contacts, you must remove the lenses or get someone to remove them for you, with CLEAN, uncontaminated fingers. Destroy the lenses after exposure, they are not cleanable.
DO NOT RUB IT IN.
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