https://www.dailypundit.com/2021/05/02/gas-masks-guest-post-by-phillip-bromley/
Not the first thing to buy, but definitely something to consider once water, food, defensive equipment, and ammo have been addressed.
On Gas Masks
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Western Rifle Shooters Association
World War 3 has already started and you will be impacted. The only open questions are when, by whom, and to what extent. Tempus fugit.