# laurel-area-yellowstone-county-mt · MONTANA · Yellowstone County · Sulfur Dioxide (1971) — Current EPA nonattainment county designations by pollutant

For laurel-area-yellowstone-county-mt · MONTANA · Yellowstone County · Sulfur Dioxide (1971), pollutant / naaqs is Sulfur Dioxide (1971); nonattainment area name is Laurel Area (Yellowstone County), MT; partial county is yes; county or area is Yellowstone County; state is MONTANA; data current as of is August 31, 2026, recorded from its source on 2026-08-31.

- **Row ID:** laurel-area-yellowstone-county-mt _(our reading, not quoted from the source)_
- **State:** MONTANA _(our reading, not quoted from the source)_
- **County or area:** Yellowstone County _(verified: appears in the quote below)_
- **Pollutant / NAAQS:** Sulfur Dioxide (1971) _(verified: appears in the quote below)_
- **Partial county:** yes _(our reading, not quoted from the source)_
- **Nonattainment area name:** Laurel Area (Yellowstone County), MT _(verified: appears in the quote below)_
- **Data current as of:** August 31, 2026 _(verified: appears in the quote below)_

## What the source says

> Yellowstone County | Sulfur Dioxide (1971) | * | Laurel Area (Yellowstone County), MT

## Source

- https://www3.epa.gov/airquality/greenbook/ancl.html

Last verified: 2026-08-31. Review by: 2027-02-27.
Part of [Current EPA nonattainment county designations by pollutant](https://referencesource.org/nonattainment-county-designations-by-pollutant/).