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Argon Tier II reporting threshold

Yes — once you hold 10,000 pounds or more of argon at any one time during the year.

The number that counts is the most you had on site at one time, not the total you bought over the year, and not what is there today.

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Extremely hazardous substance?
No — the ordinary 10,000 pound limit applies.
Why this one counts
Welding shielding gas. It counts as a gas under pressure and a simple asphyxiant.

40 CFR 370.10 — 10,000 pounds · 40 CFR 370.45(a) — filed on or before 1 March each year

Your state may set a lower limit

7 of the states we have read set the threshold itself below the federal one: OR, CA, VT, LA, AK, DE, OH.

5 more are strict in a different way — NC, MO, NV, NJ, RI keep the federal numbers but add a separate filing or cover more chemicals. Those are not the same thing, and we do not call them the same thing.

Where we have not read a state’s own code, we say so rather than guess.

Every rule we apply, with its source

Find out for your site

argon is one chemical. The filing counts everything you keep, added up across every place you keep it. The checker works that out and shows the rule behind each number.

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