HOME >> BIOLOGY >> NEWS
Study: Emission of smog ingredients from trees is increasing rapidly

Changes in U.S. forests caused by land use practices may have inadvertently worsened ozone pollution, according to a study led by Princeton University scientists.

The study examined a class of chemicals that are emitted as unburned fuel from automobile tailpipes and as vapors from industrial chemicals, but also come naturally from tree leaves. These chemicals, known collectively as VOCs, react with other pollutants to form ozone, a bluish, irritating and pungent gas that is a major form of smog in the lower atmosphere.

While clean-air laws have reduced the level of man-made VOCs (volatile organic compounds), the tree-produced varieties have increased dramatically in some parts of the country, the study found. The increase stems from intensified tree farming and other land use changes that have altered the mix of trees in the landscape, said Drew Purves, the lead author of the study that included scientists from four universities.

"There are seemingly natural but ultimately anthropogenic (human-caused) processes in the landscape that have had larger effects on VOC emissions than the deliberate legislated decreases," said Purves.

Although scientists knew that trees contribute substantial amounts of VOCs to the atmosphere, the rate of increase in recent decades was previously unrecognized. "If we don't understand what's going on with biogenic (plant-produced) VOCs, we are not going to be able to weigh different air-quality strategies properly," said Purves. "It's a big enough part of the puzzle that it really needs to go in there with the rest."

The study may help explain why ozone levels have not improved in some parts of the country as much as was anticipated with the enactment of clean-air laws, Purves said. Environmental technologies such as catalytic converters and hoses that collect fumes at gas pumps have substantially reduced human-produced VOCs. However, in some parts of the country -- particularly the area extending f
'"/>

Contact: Steven Schultz
sschultz@princeton.edu
609-258-5729
Princeton University
28-Sep-2004


Page: 1 2 3 4

Related biology news :

1. Study: A little help from friends makes wounds heal faster
2. Study: Mothers turn fearless when peptide level drops
3. Study: Artificial sweetener may disrupt bodys ability to count calories
4. Study: Mimicking viruses may provide new way to defeat them
5. Study: Stroke victims may retain continuous motion ability
6. Study: Adults maintain significant improvement in ADHD with long-term use of amphetamine
7. Study: Prenatal screening in Haiti region cut syphilis by 75 percent
8. Study: Isoflavone-enriched soy proteins fail to increase bone mineral density in young women
9. Study: Genome-wide scanning unravels complex birth defect
10. Study: Higher energy intake, obesity affects all age groups, not just youths
11. Study: Showering boosts concentrations of potentially hazardous trihalomethanes

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:2/1/2020)... ... 2020 , ... Liver cancer, called hepatocellular carcinoma (HCC), occurs each year in ... HCC is the 5th most common cancer and the 2nd leading cause of cancer ... incidence of HCC, while China has half of all patients suffering from liver cancer. ...
(Date:1/29/2020)... ... 29, 2020 , ... VGXI, a world leading contract manufacturer ... vaccine against the novel coronavirus (2019-nCoV) that has recently emerged in Wuhan, China ... million from the Coalition for Epidemic Preparedness Innovations (CEPI) will fund the vaccine ...
(Date:1/27/2020)... DIEGO (PRWEB) , ... January 27, 2020 , ... ... Thorne as Chairman. Thorne is a noted investor, tech entrepreneur, and former senior ... as Executive Chairman of Broadline Capital, the global alternative investment firm. , ...
Breaking Biology News(10 mins):
(Date:1/22/2020)... ... January 21, 2020 , ... Microbial Discovery ... Southern Midwest Region Industrial and Institutional (I&I) Account Manager. Darrell will focus on ... , Darrell brings over 30 years of sales experience working across multiple different ...
(Date:1/10/2020)... ... January 09, 2020 , ... GenScript Biotech Corp., ... Biotech Global Forum on Jan. 14 in San Francisco, coinciding with the JP ... and the Booming China Market," will feature gene and cell therapy leaders in ...
(Date:1/7/2020)... Mass. (PRWEB) , ... January 06, 2020 , ... ... for a Digital World at The Fletcher School at Tufts University, is pleased ... Sloan Foundation. The grant will be administered by Tufts University, and will help ...
(Date:12/30/2019)... EGG HARBOR TOWNSHIP, N.J. (PRWEB) , ... December ... ... premier manufacturer of custom built, helium-based leak testing instruments for the Pharmaceutical, Biotechnology, ... its new SIMS Version 1.11.19 21 CFR Part 11 compliant software program specific ...
Breaking Biology Technology:
Cached News: