# indiana-pa · PENNSYLVANIA · Armstrong County · Sulfur Dioxide (2010) — Current EPA nonattainment county designations by pollutant

For indiana-pa · PENNSYLVANIA · Armstrong County · Sulfur Dioxide (2010), pollutant / naaqs is Sulfur Dioxide (2010); nonattainment area name is Indiana, PA; partial county is yes; county or area is Armstrong County; state is PENNSYLVANIA; data current as of is August 31, 2026, recorded from its source on 2026-08-31.

- **Row ID:** indiana-pa _(our reading, not quoted from the source)_
- **State:** PENNSYLVANIA _(our reading, not quoted from the source)_
- **County or area:** Armstrong County _(verified: appears in the quote below)_
- **Pollutant / NAAQS:** Sulfur Dioxide (2010) _(verified: appears in the quote below)_
- **Partial county:** yes _(our reading, not quoted from the source)_
- **Nonattainment area name:** Indiana, PA _(verified: appears in the quote below)_
- **Data current as of:** August 31, 2026 _(verified: appears in the quote below)_

## What the source says

> Armstrong County | Sulfur Dioxide (1971) | * | Armstrong County: Madison, Mahoning, Boggs, Washington, Pine, PA | Sulfur Dioxide (2010) | * | Indiana, PA

## 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/).