Air Quality Plan; Arizona; Agricultural Best Management Practices Rules for the West Pinal County PM10 Nonattainment Area
Key claim: EPA is proposing to approve Arizona rules that would require farms and livestock operations in West Pinal County to use dust-control practices to cut PM10 particle pollution.
Abstract
(Proposed Rule · Environmental Protection Agency) The U.S. Environmental Protection Agency (EPA) is proposing to approve a revision to the Arizona Department of Environmental Quality (ADEQ or “State”) portion of the Arizona State Implementation Plan (SIP). This revision concerns emissions of particulate matter (PM) that are 10 micrometers ([mu]m) or smaller in diameter (PM10) from agricultural crop and animal operations in the West Pinal County PM10 nonattainment area. We are proposing to approve two local rules to regulate these emission sources under the Clean Air Act (CAA or “Act”).
Why this matters
PM10 dust from tilling, livestock pens, and unpaved farm roads is a major air-quality issue in arid Western farming regions, and Clean Air Act SIP approvals convert state agricultural BMP rules into federally enforceable requirements. For West Pinal County farmers, approval would lock in specific practices (such as reduced tillage, watering, or vegetative cover) as compliance obligations, while residents gain enforceable air-quality protections.