EPA proposes new ozone standards

June 21, 2007

The U.S. Environmental Protection Agency announced a proposal Thursday to strengthen the nation's air quality standard for ground-level ozone.

The EPA recommended an ozone standard within a range of 0.070 to 0.075 parts per million, as well as soliciting comments on alternative standards within a range from 0.060 ppm up to the level of the current 8-hour ozone standard, of 0.08 ppm.

EPA scientists said ground-level ozone -- the primary component of smog -- is not emitted directly into the air but is created through a reaction of nitrogen oxides and volatile organic compound emissions in the presence of sunlight. Major man-made sources include emissions from industrial facilities, electric utilities, motor vehicle exhaust, gasoline vapors, and chemical solvents'

The EPA also proposed revising the "secondary" standard for ozone to improve protection for plants, trees and crops during the growing season. The secondary standard is based on scientific evidence indicating exposure to even low levels of ozone can damage vegetation.

The agency said it will have public hearings on its proposals: Aug. 30 in Los Angeles and Philadelphia and Sept. 5 in Chicago and Houston.

Copyright 2007 by United Press International

Explore further: EPA intends tougher downwind air-pollution rule in 23 states

Related Stories

EPA sets new ozone standard, disappointing all sides

October 1, 2015

The Obama administration on Thursday established stricter limits on the smog-causing pollution linked to asthma and respiratory illness, drawing swift condemnation from business leaders and Republicans who warned of damage ...

Background ozone a major issue in US West

September 30, 2015

Levels of "background ozone"—ozone pollution present in a region but not originating from local, human-produced sources—are high enough in Northern California and Nevada that they leave little room for local ozone production ...

EPA sets stricter emission standards for oil refineries

September 29, 2015

The Environmental Protection Agency announced new rules Tuesday to reduce toxic air pollution from oil refineries by forcing operators to adopt new technology that better monitors and controls emissions.

Recommended for you

Amazon deforestation leaps 16 percent in 2015

November 28, 2015

Illegal logging and clearing of Brazil's Amazon rainforest increased 16 percent in the last year, the government said, in a setback to the aim of stopping destruction of the world's greatest forest by 2030.


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.