U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 21, 2026

All TitlesTitle 40Chapter IPart 52Subpart Q - Subpart Q—Iowa
§ 52.820 - Identification of plan.
§ 52.821 - Classification of regions.
§ 52.822 - Approval status.
§ 52.823 - PM10 State Implementation Plan Development in Group II Areas.
§ 52.824 - Original identification of plan section.
§ 52.825 - Compliance schedules.
§§ 52.826-52.827 - §[Reserved]
§ 52.828 - Enforcement.
§§ 52.829-52.832 - §[Reserved]
§ 52.833 - Significant deterioration of air quality.
§ 52.834 - Control strategy: Sulfur dioxide.
§ 52.840 - Interstate pollutant transport provisions; What are the FIP requirements for decreases in emissions of nitrogen oxides?
§ 52.841 - Interstate pollutant transport provisions; What are the FIP requirements for decreases in emissions of sulfur dioxide?
§ 52.842 - Visibility protection.
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