# psd-any-other-source-250tpy — Clean Air Act "major source" emission thresholds by pollutant and area classification

For psd-any-other-source-250tpy, which major-source test is PSD major stationary source (40 CFR 52.21) — any other source category; pollutant or pollutant class is a regulated NSR pollutant; threshold (tons per year) is 250; definition heading is Major stationary source means, recorded from its source on 2026-08-31; source re-checked 2026-09-09.

- **Row ID:** psd-any-other-source-250tpy _(our reading, not quoted from the source)_
- **Which major-source test:** PSD major stationary source (40 CFR 52.21) — any other source category _(our reading, not quoted from the source)_
- **Pollutant or pollutant class:** a regulated NSR pollutant _(verified: appears in the quote below)_
- **Threshold (tons per year):** 250 _(verified: appears in the quote below)_
- **Definition heading:** Major stationary source means _(verified: appears in the quote below)_

## What the source says

> Notwithstanding the stationary source size specified in <https://www.ecfr.gov/current/title-40/section-52.21#p-52.21(b)(1)(i)(a)> paragraph (b)(1)(i)(a) of this section, any stationary source which emits, or has the potential to emit, 250 tons per year or more of a regulated NSR pollutant; or

## Source

- https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-52/subpart-A/section-52.21

Last verified: 2026-09-09. Review by: 2027-08-31.
Part of [Clean Air Act "major source" emission thresholds by pollutant and area classification](https://referencesource.org/clean-air-act-major-source-thresholds/).