Federal Register #EPA-R09-OAR-2025-0058

EPA Approves Stricter NOX Emission Rule for Portland Cement Kilns in Eastern Kern, CA

This notice announces the EPA's approval of a regulatory revision impacting air quality standards for Portland cement kilns in Eastern Kern, California. - Government Buyer: - Environmental Protection Agency (EPA) - Focused on the Eastern Kern Air Pollution Control District (EKAPCD) within California - OEMs and Vendors: - No Original Equipment Manufacturers (OEMs) or vendors are named, as this is a regulatory action, not a procurement - Products/Services Requested: - No products or services are being procured - The action pertains to the enforcement of EKAPCD Rule 425.3, which regulates oxides of nitrogen (NOX) emissions from Portland cement kilns - Unique or Notable Requirements: - The rule removes previous exemptions for NOX emissions during startup, shutdown, and breakdown periods - Alternative emission limits are instituted for these periods to ensure stricter air quality control - The revision corrects prior deficiencies and replaces a previously disapproved version of the rule - The action is intended to improve air quality in Kern County, California, by enforcing stricter NOX emission controls on cement kilns - No procurement, solicitation, or contract opportunity is associated with this notice

Description

The Environmental Protection Agency (EPA) is taking final action to approve a revision to the Eastern Kern Air Pollution Control District portion of the California State Implementation Plan. This revision regulates emissions of oxides of nitrogen (NOX) from Portland cement kilns under the Clean Air Act. The approval replaces a previously disapproved version of the rule, addressing prior deficiencies related to emission exemptions during startup, shutdown, and breakdown conditions. The rule is effective May 18, 2026, and aims to improve air quality by controlling NOX emissions from cement kilns in Kern County, California.

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