# Dibenzo[a,i]pyrene — US federal chemical regulatory reporting thresholds by program (CERCLA, EPCRA, CAA)

For Dibenzo[a,i]pyrene, cas no. is 189-55-9; cercla rq (lbs) is 10; rcra waste number is U064; regulatory categories is 4, verified against its source on 2026-08-05.

- **Substance:** Dibenzo[a,i]pyrene _(verified: appears in the quote below)_
- **CAS No.:** 189-55-9 _(verified: appears in the quote below)_
- **CERCLA RQ (lbs):** 10 _(verified: appears in the quote below)_
- **RCRA waste number:** U064 _(verified: appears in the quote below)_
- **Regulatory categories:** 4 _(verified: appears in the quote below)_

## What the source says

> Dibenzo[a,i]pyrene | 189-55-9 | 4 | U064 | 10 (4.54)

## Source

- https://www.ecfr.gov/current/title-40/chapter-I/subchapter-J/part-302/section-302.4

Last verified: 2026-08-05. Review by: 2027-08-05.
Part of [US federal chemical regulatory reporting thresholds by program (CERCLA, EPCRA, CAA)](https://referencesource.org/chemical-regulatory-reporting-thresholds/).