Reviewed educational evidence

Acid rain evidence guide

Each card below passed the reviewed publication boundary. Follow its source and keep the visible limits attached to the summary.

Platform methodology boundary

Power-plant emissions, acid deposition, rail dust, particulate readings, and water turbidity are different measurement categories and cannot substitute for one another.

This platform distinction is not attributed to either evidence card and does not turn one measurement category into evidence for another.

AGENCY_REPORTED_FACT

EPA states that the Acid Rain Program was established under Title IV, addresses sulfur dioxide and nitrogen oxides as the primary acid-rain precursors from the power sector, and began in 1995.

Geography: United States

Reviewed August 14, 2026

Correction status: current

Sources

U.S. Environmental Protection Agency
Acid Rain Program
Source type
PRIMARY_AGENCY_GUIDANCE
Publication date
Original publication date not stated; source last updated February 26, 2026
Source status
Last updated or validity checked: February 26, 2026
Reviewed
August 14, 2026
Pinpoint
Overview, first two paragraphs
Source qualification
Official EPA program overview; source content and last-updated date rechecked on August 14, 2026.
License and reuse
Short original attributed summary and direct link only; no source images, maps, figures, or third-party material are reproduced.

What this does not establish

An inference about Montana
Cause or causal contribution
Identification of a source
A current violation
A regulatory determination

See Corrections for the correction and retraction process.