Navigation Links
Historic legacy of lead pollution persists despite regulatory efforts
Date:2/16/2013

Efforts to reduce lead pollution have paid off in many ways, yet the problem persists and will probably continue to affect the health of people and animals well into the future, according to experts speaking at the annual meeting of the American Association for the Advancement of Science (AAAS) in Boston.

"Things have substantially improved with the virtual elimination of leaded gasoline, restrictions on lead paint, and other efforts to limit releases of industrial lead into the environment. But the historic legacy of lead pollution persists, and new inputs of industrial lead are adding to it," said A. Russell Flegal, professor of environmental toxicology at the University of California, Santa Cruz.

Flegal will present a history of industrial lead contamination and explain why the problem won't go away in a AAAS symposium on Saturday, February 16. The good news, he said, is that atmospheric lead concentrations in the United States have fallen by 89 percent in the past three decades, and average blood lead levels in U.S. children have shown a corresponding decline, from 15 micrograms per deciliter (ug/dL) in 1976 to 1.3 ug/dL in 2008.

The bad news is that blood lead levels are still about 100 times higher than the natural background level, and there is no known threshold for lead toxicity. In other words, even tiny amounts of lead in the body can be harmful.

Lead pollution is a 5,000-year-old problem, Flegal said, citing elevated lead levels in Chinese lake sediments deposited during the Bronze Age. Recent records from U.S. lake sediments show decreases in lead pollution since the phasing out of leaded gasoline began in the 1970s. But industrial activities around the globe continue to release more lead into the environment. Major sources of lead emissions include the burning of coal, especially in developing countries such as China and India. Lead from these sources spreads around the globe, so that environmental lead contamination can be detected even in "pristine" environments such as the Arctic and the Swiss Alps, Flegal said.

In addition, consumer products contaminated with lead continue to enter the U.S. from other countries through global trade. These include some foods, health products, and children's toys. Just last year, U.S. customs officials seized 1,400 Halloween pirate costumes imported from China that contained 11 times the allowable level of lead.

Unlike organic pollutants, lead never degrades. To illustrate the persistence of lead in the environment, Flegal cites a 2005 study showing that 90 percent of the current atmospheric lead pollution in the Los Angeles basin originally came from leaded gasoline. Lead particles continue to be deposited on the ground and resuspended into the air decades after their original source was eliminated. Studies by Flegal and others also show that forest fires in California remobilize lead that was deposited in soils decades ago.

"It will take decades to centuries to purge these historic depositions from the environment," Flegal said.


'/>"/>

Contact: Tim Stephens
stephens@ucsc.edu
831-459-2495
University of California - Santa Cruz
Source:Eurekalert

Related medicine news :

1. Guyana government and Panthera sign historic jaguar conservation agreement
2. New study shows effects of prehistoric nocturnal life on mammalian vision
3. Akaibu and Haystac Partner to Leverage Legacy Archive Assets
4. Legacy bead program helps children and their families cope with life-threatening illnesses
5. Air pollution primes children for asthma-related cockroach allergy
6. Maternal exposure to outdoor air pollution associated with low birth weights worldwide
7. Study Sees Possible Link Between Air Pollution and Autism Risk
8. Air pollution, gone with the wind
9. Gestational exposure to urban air pollution linked to vitamin D deficiency in newborns
10. UT Dallas engineers identify material that reduces pollution from diesel engines
11. Using Exhaust Fan on a Gas Stove Cuts Pollution: Study
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/8/2016)... ... December 08, 2016 , ... STATEN ISLAND, N.Y., Nov. 24, ... to the highest standards of trauma, maternity, cancer and chronic obstructive pulmonary disease ... CEO, Dr. Daniel Messina. , Among the recognitions, the American College of Surgeons' ...
(Date:12/8/2016)... (PRWEB) , ... December 08, 2016 , ... California Senate ... medical payments per workers’ compensation claim in 2013 and 2014, according to CompScope™ ... Research Institute (WCRI) . , According to the study, medical payments per claim in ...
(Date:12/8/2016)... ... December 08, 2016 , ... ... Care Act. Dr. Botelho advocates for the mass media launching of story movements ... ongoing opportunities to share their unfortunate experiences; such a movement can generate the ...
(Date:12/8/2016)... ... December 08, 2016 , ... Dickinson Insurance and ... headquartered in Little Rock, has initiated a charity drive to provide support and ... to End Senior Hunger, Arkansas ranks first in senior hunger statewide, third in ...
(Date:12/8/2016)... Birmingham, AL (PRWEB) , ... December 08, 2016 ... ... insurance and financial planning services from offices headquartered in Jefferson County, is announcing ... Pathways Woman’s Shelter in Birmingham. , The number of homeless women and children ...
Breaking Medicine News(10 mins):
(Date:12/9/2016)... Dec. 9, 2016 Department of Health Secretary ... for medical marijuana dispensaries under Act 16 are slated ... and are now available online . ... the plan for operation; process for dispensing medical marijuana; ... as where the dispensary facilities can be located," said ...
(Date:12/8/2016)... , Dec. 8, 2016 Australia Ophthalmic Lasers ... report, "Australia Ophthalmic Lasers Market Outlook to 2022", provides ... The report provides value, in millions of US dollars, ... segements - Excimer Lasers, Femtosecond Lasers and YAG Lasers. ... shares data for each of these market segements, and ...
(Date:12/8/2016)... , Dec. 8, 2016 Global ... report on the global interventional radiology market analyzes ... The report comprises an elaborate executive summary, including ... various segments and sub-segments. The research is ... research formed the bulk of our research efforts ...
Breaking Medicine Technology: