Regulations last checked for updates: Jun 16, 2025

Title 40 - Protection of Environment last revised: Nov 16, 2025
All TitlesTitle 40Chapter IPart 49Subpart M - Subpart M—Implementation Plans for Tribes—Region X
View all text of Subpart M [§ 49.9861 - § 49.17810]
§ 49.10525 - Classification of regions for episode plans.

The air quality control region which encompasses the lands in trust that are within the Puyallup Reservation is classified as follows for purposes of episode plans:

Pollutant Classification
Carbon monoxideI
Nitrogen dioxideIII
OzoneI
Particulate matter (PM10)I
Sulfur oxidesIA
authority: 42 U.S.C. 7401,
source: 63 FR 7271, Feb. 12, 1998, unless otherwise noted.
cite as: 40 CFR 49.10525
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