Navigation Links
Smog's Origins Get Clearer
Date:3/20/2008

A key chemical reaction helps form ozone haze, scientists say

THURSDAY, March 20 (HealthDay News) Scientists say they've identified a chemical reaction that's an important contributor to smog.

This chemical reaction -- which involves reactions between water vapor and nitrogen dioxide (NO2) in "excited" states -- was long assumed to be unimportant. But now chemists at the University of California, San Diego, conclude that it's actually a major contributor to urban ozone, the main component of smog.

They said their findings, published in the March 21 issue of the journal Science, may help air quality experts develop better ways to reduce ozone in hundreds of urban areas in the United States, and in other cities around the world that have serious air quality and smog problems.

Currently, more than 100 million people worldwide live in cities that don't meet international air quality standards, according to a news release on the study.

"This study provides us with additional insight into the chemistry of urban ozone production," team leader Amitabha Sinha, a professor of chemistry and biochemistry, said in a prepared statement.

"It shows us that the chemistry of urban ozone is even more complicated than we initially assumed. With improved knowledge of how ozone is produced, we should be in a better position to control the air quality of large urban areas across the United States as well as around the world," Sinha said.

Urban ozone levels, which peak in the afternoon, are caused by a series of complex chemical reactions involving the interaction of sunlight with hydrocarbons and nitrogen oxides from vehicle exhaust. Ozone is produced when hydroxyl radicals (OH) are produced from water vapor.

It was long believed that most OH radicals involved in urban ozone production were generated by the reaction of excited oxygen atoms with water vapor. But in their laboratory experiments, the UCSD team found that the reaction between excited nitrogen dioxide (NO2) and water vapor also plays a significant role in the production of OH radicals.

More information

The American Academy of Family Physicians discusses air pollution and health.



-- Robert Preidt



SOURCE: University of California, San Diego, news release, March 20, 2008


'/>"/>
Copyright©2008 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. Worm Study Points to Sexualitys Origins
2. Brain Activity Points to Origins of Anorexia
3. Study Sheds Light on Origins of Sudden Cardiac Death
4. Study Gets Closer to Origins of Leukemia
5. Autisms origins: Mothers antibody production may affect fetal brain
6. Genetic research unveils common origins for distinct clinical diagnoses
7. Link Between Air Pollution, Stroke Gets Clearer
8. Transparent fish to make human biology clearer
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Smog's Origins Get Clearer
(Date:6/25/2016)... Austin, TX (PRWEB) , ... June 25, 2016 , ... ... Fellow of the American College of Mohs Surgery and to Dr. Russell Peckham for ... popular and highly effective treatment for skin cancer. The selective fellowship in Mohs Micrographic ...
(Date:6/25/2016)... (PRWEB) , ... June 25, 2016 , ... First ... United States, named Dr. Sesan Ogunleye, as the Medical Director of its new Mesquite-Samuell ... facility Medical Director of our new Mesquite location,” said Dr. James M. Muzzarelli, Executive ...
(Date:6/25/2016)... ... June 25, 2016 , ... On Friday, June 10, ... Bronze Wellness at Work award to iHire in recognition of their exemplary accomplishments in ... the 7th annual Maryland Workplace Health & Wellness Symposium at the BWI Marriott in ...
(Date:6/24/2016)... ... ... Those who have experienced traumatic events may suffer from a complex set of ... or alcohol abuse, as a coping mechanism. To avoid this pain and suffering, Serenity ... event. , Trauma sufferers tend to feel a range of emotions, from depression, guilt, ...
(Date:6/24/2016)... ... 24, 2016 , ... The Pulmonary Hypertension Association (PHA) learned ... receive two significant new grants to support its work to advance research and ... by recognizing patients, medical professionals and scientists for their work in fighting pulmonary ...
Breaking Medicine News(10 mins):
(Date:6/24/2016)... 2016  Collagen Matrix, Inc., ("Collagen Matrix") the ... of collagen and mineral based medical devices for ... Bill Messer has joined the company as ... the growing portfolio of oral surgery, neurosurgery, orthopaedic ... joins the Collagen Matrix executive team as an ...
(Date:6/24/2016)... CAMBRIDGE, Mass. , June 24, 2016 /PRNewswire/ ... the Spaulding Rehabilitation Network,s Dean Center for ... of Physical Medicine and Rehabilitation, MIT Hacking Medicine, ... Center for Innovation, today announced the five finalists ... Hackathon for Lyme disease.  More than 100 scientists, ...
(Date:6/24/2016)... Research and Markets has ... 2015-2025: Applications, Technologies, Forecasts" report to their ... Electronics, Smart Skin, Structural Health Monitoring, Composite Smart ... electronics involves electronic and/or electrical components and circuits ... structures such as vehicle bodies or conformally placed ...
Breaking Medicine Technology: