An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

What is considered cryogenic conditions?

The Tier II Hazardous Chemical Inventory form, used to meet annual EPCRA §312 reporting requirements, requires facility owners or operators to note whether reported hazardous chemicals are present at, above, or below ambient temperature.  For temperatures below ambient, the form distinguishes between “less than ambient temperature but not cryogenic” and “cryogenic conditions.”  What is considered cryogenic conditions?  

Some gases are stored under “cryogenic conditions,” which means that they are stored at very low temperatures (-130 degrees Fahrenheit or less).  Examples of gases that may be stored this way include air, argon, carbon monoxide, ethylene, fluorine, helium, hydrogen, methane, nitrogen, and oxygen.