# 2025-10036: EPA Considers Cleaner Rules for Eastern Kern Cement Kilns

2025-10036, Air Plan Approval; California; Eastern Kern Air Pollution Control District; Portland Cement Kilns, is a Federal Register proposed rule from Environmental Protection Agency published 2025-06-04, effective Comments must be received on or before July 7, 2025.; PRIA reads it as touching household money (as of 2026-10-27).

- Canonical: https://policyrisk.com/federal-register/2025-10036
- As of: 2026-10-27
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2025-10036
- Title: Air Plan Approval; California; Eastern Kern Air Pollution Control District; Portland Cement Kilns
- Type: Proposed Rule
- Agencies: Environmental Protection Agency
- Citation: 90 FR 23653
- Published: 2025-06-04
- Effective: Comments must be received on or before July 7, 2025.
- Comments close: not stated
- Significant: no
- Touches household money: yes
- Regulation identifier numbers: none
- Last updated: 2026-10-27

## In one line

EPA Considers Cleaner Rules for Eastern Kern Cement Kilns

## Summary

The EPA wants to approve new rules for Portland cement kilns in Eastern Kern, California, to cut down on pollution from nitrogen oxides (NOX). This change helps clean the air and follows the Clean Air Act. If you have thoughts, send them by July 7, 2025—this could affect local businesses but aims to protect everyone's health.

## Abstract

The Environmental Protection Agency (EPA) is proposing to approve a revision to the Eastern Kern Air Pollution Control District (EKAPCD or "District") portion of the California State Implementation Plan (SIP). This revision concerns emissions of oxides of nitrogen (NO<INF>X</INF>) from Portland cement kilns. We are proposing to approve a local rule to regulate these emission sources under the Clean Air Act (CAA or "Act"). We are taking comments on this proposal and plan to follow with a final action.

## Effects PRIA read

- New NOX limit for kiln normal operations: cost, high. Portland cement kiln operators in Eastern Kern must meet a NOX emission limit of 2.8 pounds of NOX per ton of clinker averaged over a 30-operating day rolling period (as adopted November 13, 2024 and submitted December 12, 2024). This numerical operational limit will be incorporated into the federa…
- Startup/shutdown and breakdown rule changes: cost, medium. The rule removes exemptions for startup, shutdown, and breakdown, replaces them with an alternative NOX mass limit of 21,528 pounds of NOX per day during startup and shutdown, requires daily recording of startup and shutdown NOX emission rates, and revises the definitions of "startup" and "shutdown…
- Reduced NOX to improve local air quality: benefit, medium. EPA says NOX emissions contribute to ground-level ozone, smog, and particulate matter that harm human health and the environment; the revised Rule 425.3 is intended to establish RACT-level NOX controls for Portland cement kilns in the Eastern Kern ozone nonattainment area to help address those prob…
- Regulatory relief if EPA finalizes approval: benefit, medium. If EPA finalizes approval of the November 13, 2024 Rule 425.3 submission, that version will be incorporated into the federally enforceable SIP and EPA states that all associated sanctions and Federal Implementation Plan (FIP) clocks started by the June 5, 2023 limited disapproval would be permanent…

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## Sources
- [2025-10036 on federalregister.gov](https://www.federalregister.gov/documents/2025/06/04/2025-10036/air-plan-approval-california-eastern-kern-air-pollution-control-district-portland-cement-kilns)
- [2025-10036 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2025-06-04/pdf/2025-10036.pdf)

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Source: PRIA, https://policyrisk.com/federal-register/2025-10036 (as of 2026-10-27).