Frequent Questions

Release of metal in solid form

If a metal is released in solid form at or above its Reportable Quantity (RQ), is it considered a reportable release?

The Agency allows exclusions for massive forms of certain metals (antimony, arsenic, beryllium, cadmium, chromium, copper, lead, nickel, selenium, silver, thallium, and zinc) when the diameter of the released metal equals or exceeds 100 micrometers (0.004 inches). The Agency deliberately set the cutoff size 10 times larger than the maximum size considered by EPA to be respirable dust to ensure that the government would be notified of releases containing small, inhalable particles of metals.

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