# pm10-nonattainment-serious — Clean Air Act "major source" emission thresholds by pollutant and area classification

For pm10-nonattainment-serious, which major-source test is Part D Title I nonattainment major stationary source; pollutant or pollutant class is PM-10; area classification (if applicable) is Serious; threshold (tons per year) is 70; definition heading is Major source means any stationary source, recorded from its source on 2026-08-19; source re-checked 2026-09-09.

- **Row ID:** pm10-nonattainment-serious _(our reading, not quoted from the source)_
- **Which major-source test:** Part D Title I nonattainment major stationary source _(our reading, not quoted from the source)_
- **Pollutant or pollutant class:** PM-10 _(verified: appears in the quote below)_
- **Area classification (if applicable):** Serious _(verified: appears in the quote below)_
- **Threshold (tons per year):** 70 _(verified: appears in the quote below)_
- **Definition heading:** Major source means any stationary source _(verified: appears in the quote below)_

## What the source says

> For particulate matter (PM-10) nonattainment areas classified or treated as classified as “Serious,” sources with the potential to emit 70 tpy or more of PM-10.

## Source

- https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-70/subpart-A/section-70.2

Last verified: 2026-09-09. Review by: 2027-02-15.
Part of [Clean Air Act "major source" emission thresholds by pollutant and area classification](https://referencesource.org/clean-air-act-major-source-thresholds/).