Navigation Links
'Safe' Ozone Levels May Not Be for Some
Date:7/27/2009

Study finds lung problems after exercise at lower concentrations

MONDAY, July 27 (HealthDay News) -- Ozone levels considered safe under current standards can have a negative effect on lung function in healthy people, say U.S. researchers.

The National Ambient Air Quality Standard allows for ozone concentrations of up to 75 parts per billion over an eight-hour period. But a new study "found that 6.6 hours exposure to mean ozone concentrations as low as 70 parts per billion have a significant negative effect on lung function," Edward Schelegle, of the University of California, Davis, said in a news release from the American Thoracic Society.

He and his colleagues studied lung function in 31 healthy nonsmokers who were exposed to ozone concentrations of 60, 70, 80 and 87 parts per billion, or filtered air, while doing moderate exercise. They found that significant decreases in lung function and respiratory symptoms occurred at ozone concentrations of 70 parts per billion or more, beginning after 5.6 hours of exposure.

"These data tell us that even at levels currently below the air quality standard, healthy people may experience decreased lung function after just a few hours of moderate to light exercise, such as bicycling or walking," Schelegle said.

"While these changes were fully reversible within several hours, these findings highlight the need to study susceptible individuals, such as asthmatics, at similar ozone concentrations and durations of exposure," he said. "These studies are needed to better understand the acute rise in hospitalizations that often occur in conjunction with high-ozone periods."

In addition, the researchers urged more study to better understand the mechanisms that determine individual ozone responsiveness in both healthy and susceptible people.

"Understanding how these mechanisms change with repeated daily exposure is critical, especially as ambient ozone levels are often elevated several days in a row," Schelegle said.

The study appears in the August 1 issue of the American Journal of Respiratory and Critical Care Medicine.

More information

The U.S. Centers for Disease Control and Prevention has more about air pollution and respiratory health.



-- Robert Preidt



SOURCE: American Thoracic Society, news release, July 26, 2009


'/>"/>
Copyright©2009 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. New Research Reveals the Majority of Parents Overlook Key Steps to Keep Curious Toddlers Safe at Home
2. Pennsylvania Patient Safety Authority Supports National Patient Safety Day
3. Convection Cooled 350-Watt Open Frame Power Supply Meets Medical and Industrial Safety Standards
4. New Anesthesia May Be Safer for Critically Ill
5. Mass. General team develops potentially safer general anesthetic
6. Major Study of Malpractice Insurance Finds No Basis to Limit Liability of Unsafe Health Care Providers
7. Safety of Swine Flu Vaccine to Face Tough Scrutiny
8. Clinical Research Safety and Ethical Standards in Developing World Up to U.S. Levels, Report Says
9. 96-Week Safety and Efficacy Findings Presented for INTELENCE(TM) (etravirine) As Part of HIV Combination Therapy
10. Study Finds Soy Safe for Men
11. Amgen Announces KRAS Safety Update to U.S. Prescribing Information for Vectibix(R) (Panitumumab)
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
'Safe' Ozone Levels May Not Be for Some
(Date:5/28/2016)... ... May 28, 2016 , ... May 26, 2016- In search ... Fighting Challenge with theme event of “K Warriors” on June 4, 2016 at Ashbury ... , The event is sponsored and hosted by Shaolin Institute and sanctioned by KSF ...
(Date:5/27/2016)... ... 27, 2016 , ... Two director-level employees of Horizon Blue Cross Blue Shield ... (TWIN) 2016 honorees. The award recognizes businesswomen who excel in their fields and ... of the MLTSS (Managed Long-Term Services and Supports) Program at Horizon NJ Health and ...
(Date:5/27/2016)... ... 27, 2016 , ... An educational campaign aimed at everyone ... courtesy of awareness-driven celebrities and thought leaders. It also provides insight to the ... leaders such as Bioness. , As patients feel increasingly concerned about the ...
(Date:5/27/2016)... ... May 27, 2016 , ... Each year Standard ... Allison Outerbridge is this year’s Life University winner of a $2,500 ... university’s Student Leadership Awards ceremony. , Outerbridge is approaching her last quarter at ...
(Date:5/26/2016)... ... May 26, 2016 , ... Cabot Corporation, Pfizer, and ... according to court documents and SEC filings. A jury has returned a ... American Optical Corporation, Case No. BC588866, Los Angeles County, California. The jury awarded ...
Breaking Medicine News(10 mins):
(Date:5/25/2016)... , May 25, 2016  Granger Diagnostics today announced ... for wounds and infections. This test ensures discovery ... select viruses. The test requires only a simple swab ... David G. Bostwick , MD, Chief ... facilitate wound healing: "We are excited to make ...
(Date:5/25/2016)... India , May 25, 2016 ... Review, H1 2016"market research report that provides an ... with comparative analysis at various stages, therapeutics assessment ... of administration (RoA) and molecule type, along with ... It also reviews key players involved in the ...
(Date:5/24/2016)...   , Study met ... bowel cleansing and superiority in , ... of the ascending colon   ... Norgine B.V. today announced new positive data from the phase ... preparation) versus standard 2 litre PEG with ascorbate. The study met ...
Breaking Medicine Technology: