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:6/24/2016)... Los Angeles, CA (PRWEB) , ... June 24, 2016 , ... ... plastic surgery procedures that most people are unfamiliar with. The article goes on to ... known procedures, but also many of these less common operations such as calf and ...
(Date:6/24/2016)... ... ... June 19, 2016 is World Sickle Cell Observance Day. In an effort to ... treatments, Serenity Recovery Center of Marne, Michigan, has issued a pain management ... (SCD) is a disorder of the red blood cells, which can cause episodes of ...
(Date:6/24/2016)... ... 2016 , ... The Pulmonary Hypertension Association (PHA) learned during ... two significant new grants to support its work to advance research and patient ... recognizing patients, medical professionals and scientists for their work in fighting pulmonary hypertension ...
(Date:6/24/2016)... ... June 24, 2016 , ... ... micro-osteoperforation for accelerated orthodontic treatment. Dr. Cheng has extensive experience with all areas ... , AcceleDent, and accelerated osteogenic orthodontics. , Micro-osteoperforation is a revolutionary adjunct ...
(Date:6/24/2016)... (PRWEB) , ... June 24, 2016 , ... Topical BioMedics, Inc, makers of Topricin and ... that call for a minimum wage raise to $12 an hour by 2020 and then ... will restore the lost value of the minimum wage, assure the wage floor does not ...
Breaking Medicine News(10 mins):
(Date:6/24/2016)... June 24, 2016 The Academy of Managed ... recommendations that would allow biopharmaceutical companies to more ... that make formulary and coverage decisions, a move that ... new medicines. The recommendations address restrictions in ... on the drug label, a prohibition that hinders decision ...
(Date:6/24/2016)... June 24, 2016 According to ... Type (Standard Pen Needles, Safety Pen Needles), Needle Length ... Growth Hormone), Mode of Purchase (Retail, Non-Retail) - Trends ... report studies the market for the forecast period of ... USD 2.81 Billion by 2021 from USD 1.65 Billion ...
(Date:6/23/2016)... , June 23, 2016  MedSource announced ... as its e-clinical software solution of choice.  This ... best possible value to their clients by offering ... The preferred relationship establishes nowEDC as the EDC ... for MedSource,s full-service clients.  "nowEDC has long been ...
Breaking Medicine Technology: