Time to harmonize national ambient air quality standards

National Ambient Air Quality Standards for Particulate Matter ; Final Rule

Will the circle be unbroken: a history of the U.S. National Ambient Air Quality Standards.

In celebration of the 100th anniversary of the Air & Waste Management Association, this review examines the history of air quality management (AQM) in the United States over the last century, with an emphasis on the ambient standards programs established by the landmark 1970 Clean Air Act (CAA) Amendments. The current CAA system is a hybrid of several distinct air pollution control philosophies...

Application of the National Ambient Air Quality Standards (NAAQS) in Urban Versus Rural Environments

The US Environmental Protection Agency is currently assessing the need for a National Ambient Air Quality Standard for the coarse fraction of particulate material (PMCF), specifically, the fraction of particulate matter between 2.5 and 10 μm in aerodynamic equivalent diameter. EPA is primarily relying on epidemiological studies that examine the possible health effects of PMCF to reach a decisio...

Global review of national ambient air quality standards for PM10 and SO2 (24 h)

Literature comparing national ambient air quality standards (AAQSs) globally is scattered and sparse. Twenty-four hour AAQSs for particulate matter <10 μm in aerodynamic diameter (PM(10)) and sulfur dioxide (SO(2)) in 96 countries were identified through literature review, an international survey, and querying an international legal database. Eighty three percent, of the 96 countries with infor...

Responses to Significant Comments on the 1996 Proposed Rule on the National Ambient Air Quality Standards for Particulate Matter