EPA proposes new ozone standards

Jun 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: Rising ocean acidity threatens sea life

add to favorites email to friend print save as pdf

Related Stories

Clean smell doesn't always mean clean air

19 hours ago

Some of the same chemical reactions that occur in the atmosphere as a result of smog and ozone are actually taking place in your house while you are cleaning. A researcher in Drexel's College of Engineering ...

Cutting emissions pays for itself, research shows

Aug 24, 2014

Lower rates of asthma and other health problems are frequently cited as benefits of policies aimed at cutting carbon emissions from sources like power plants and vehicles, because these policies also lead ...

Recommended for you

Australia set to pay polluters to cut emissions

7 hours ago

Australia is set to approve measures giving polluters financial incentives to reduce emissions blamed for climate change, in a move critics described as ineffective environmental policy.

TransCanada seeks approvals for pipeline to Atlantic

17 hours ago

TransCanada on Thursday filed for regulatory approval of a proposed Can$12 billion (US$10.7 billion) pipeline to carry western Canadian oil to Atlantic coast refineries and terminals, for shipping overseas.

Does it help conservation to put a price on nature?

21 hours ago

Putting a price on the services which a particular ecosystem provides may encourage the adoption of greener policies, but it may come at the price of biodiversity conservation. Writing today in the journal ...

User comments : 0

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.