40 CFR § 49.10105 - Classification of regions for episode plans.

---
identifier: "/us/cfr/t40/s49.10105"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 49.10105 - Classification of regions for episode plans."
title_number: 40
title_name: "Protection of Environment"
section_number: "49.10105"
section_name: "Classification of regions for episode plans."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "B"
subchapter_name: "GRANTS AND OTHER FEDERAL ASSISTANCE"
part_number: "49"
part_name: "INDIAN COUNTRY: AIR QUALITY PLANNING AND MANAGEMENT"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401,"
regulatory_source: "63 FR 7271, Feb. 12, 1998, unless otherwise noted."
cfr_part: "49"
---


# 49.10105 Classification of regions for episode plans.

The air quality control region which encompasses the Reservation of the Confederated Tribes of the Grand Ronde Community is classified as follows for purposes of episode plans:

| Pollutant | Classification |
| --- | --- |
| Carbon monoxide | I |
| Nitrogen dioxide | III |
| Ozone | I |
| Particulate matter (PM10) | I |
| Sulfur oxides | IA |