Technology Transfer Network - OAR Policy and Guidance
OAR Policy and Guidance Metarecord
Particulate Matter: Preliminary Draft Staff Paper: Additional Figures for Chapter 5 (Denver, CO and Phoenix, AZ Images)
|Signed by: Unsigned
Air Quality Strategies and Standards Division (OAQPS) / Lydia Wegman
| EPA Document Number:
particulate matter standards
As required under the Clean Air Act, the periodic review of the national ambient air quality standards (NAAQS) for particulate matter (PM) is now underway. EPA is now releasing a preliminary draft PM Staff Paper for public and peer review. Chapter 5 of the preliminary draft Staff Paper includes preliminary assessments of scientific and technical information and proposed future analyses or assessments of visibility data or information. This file includes a series of photographic representations of visual air quality in Denver, CO and Phoenix, AZ.