Top Leaderboard, Site wide
Left Masthead
September 26, 2016
Truthdig: Drilling Beneath the Headlines
Sign up for Truthdig's Email NewsletterLike Truthdig on FacebookFollow Truthdig on TwitterSubscribe to Truthdig's RSS Feed

In Some Cases of Elder Abuse, Banks Facilitated Financial Exploitation
Writings on the Wall

Truthdig Bazaar
Shark: A Visual History

Shark: A Visual History

Richard Ellis

more items

Print this item

Ozone Rise Will Choke U.S. Cities

Posted on May 18, 2014

Photo by will_hybrid (CC BY 2.0)

By Tim Radford, Climate News Network

This piece first appeared at Climate News Network.

LONDON—Stand by for long, hot North American summers of smarting eyes, tickling throats, asthma, bronchitis and emphysema. And crops could also suffer, because ground-level ozone pollution is likely to increase in the US.

Gabriele Pfister, an atmospheric scientist at the US National Center for Atmosphere Research in Colorado, and research colleagues report in the Journal of Geophysical Research: Atmospheres that Americans face a rise of 70% in summertime ozone levels by 2050.

Ozone is a form of oxygen that, in the stratosphere, protects life by absorbing dangerous ultraviolet radiation from the sun, but at ground level it is a serious component of air pollution and urban smog.

Rising temperatures, and the attendant growth of short-lived greenhouse gases such as methane and oxides of nitrogen, could turn local atmospheres into a photochemical crucible that will spur a cascade of chemical reactions and lead to higher incidence of ground-level ozone.


Square, Site wide

Unhealthy air

Almost all of the US is likely to suffer at least a few days each year of unhealthy air. The big conurbations of the East, the Midwest and the West Coast could be choking and gasping for most of the summer.

“It doesn’t matter where you are in the United States – climate change has the potential to make your air worse,” says Dr Pfister. “A warming planet doesn’t just mean rising temperatures. It means risking more summertime pollution, and the health impacts that come with it.”

She and her research colleagues looked at two possibilities. One is the notorious “business as usual” scenario, in which nitrogen oxides and volatile organic compounds from human industry go on as they have in the past. In the other, they assumed that humans would take action and cut emissions of these compounds.

Significant warming

In both scenarios, they allowed for more carbon dioxide emissions, and more significant warming. They used a new supercomputer to simulate pollution levels hour by hour for 39 hypothetical summers, under a range of meteorological conditions.

In the first option, they found that the number of eight-hour periods in which ozone would exceed 75 parts per billion –  the threshold considered unhealthy by the US Environmental Protection Agency – would increase on average by 70% across the US by 2050.

In the second scenario, even with continued climate change, cases of ozone pollution would drop dramatically - to less than one per cent of the current experience.

“Reducing emissions of ozone precursors would have an enormous effect on the air we all breathe,” Pfister said.

New and Improved Comments

If you have trouble leaving a comment, review this help page. Still having problems? Let us know. If you find yourself moderated, take a moment to review our comment policy.

Join the conversation

Load Comments
Right 1, Site wide - BlogAds Premium
Right 2, Site wide - Blogads
Right Skyscraper, Site Wide
Right Internal Skyscraper, Site wide
Join the Liberal Blog Advertising Network

Like Truthdig on Facebook