Air Pollution Increases Blood Clot Risk

(WebMD) Air pollution increases the risk of deep vein thrombosis (DVT) -- dangerous blood clots in the veins -- even at pollution levels the EPA deems "acceptable."

Harvard researcher Andrea Baccarelli, MD, PhD, and colleagues in Italy studied 870 people diagnosed with DVT from 1995 to 2005. They compared their particulate air pollution exposure in the year before their diagnosis to that of 1,210 matched people without DVT.

They found that DVT risk goes up 70% for every 10 microgram-per-cubic-meterrise in particulate air pollution above 12 micrograms per cubic meter of air (the lowest pollution level measured in the study).

The U.S. EPA standard for particulate air pollution is 150 micrograms per cubic meter of air. However, it's likely that fine and very fine particles cause most of the health risks linked to particulate air pollution. The EPA sets much lower standards for these smaller particles, which Baccarelli and colleagues did not specifically measure."

Our findings introduce a novel and common risk factor into the pathogenesis of DVT and, at the same time, give further substance to the call for tighter standards and continued efforts aimed at reducing the impact of urban air pollutants on human health," Baccarelli and colleagues conclude.

Air pollution affects the heart and blood vessels even more than the lungs, notes Robert D. Brook, MD, a University of Michigan expert on the cardiovascular effects of air pollution. An editorial by Brook accompanies the Baccarelli report in the May 12 issue of Archives of Internal Medicine.

The study, Brook notes, adds DVT to a long list of cardiovascular illnesses linked to air pollution that includes heart attacks, heart failure, stroke, and sudden death.

However, Brook warns that while Baccarelli and colleagues link air pollution to a huge increase in DVT risk, part of this result may be due to chance or the unique circumstances of the population studied. Other studies are needed to better determine the absolute risk.

Even so, Brook says, we don't have to wait for these studies -- we already know that air pollution, even at current levels, is not healthy."

You do not need to know every last detail about the archer who shot you with a poison arrow before you know you need to pull the arrow out," he writes.

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(AP PHOTO)

White House takes air out of new EPA regulations

THIS MARCH, the Environmental Protection Agency was about to take a major step forward in curbing pollutants that cause smog - until it got word from the White House to make it a baby step instead. The weakened rule will result in several thousand preventable deaths annually. Environmental groups and public health organizations should take the EPA to court for letting last-minute interference by the president and the White House's Office of Management and Budget dictate a less stringent standard.

Thanks to improved pollution controls on cars, power plants, and other industries, Americans breathe much cleaner air than they did a generation ago. But smog is still severe enough in many areas to cause respiratory and heart problems and shorten lives.

The rule regulates acceptable levels of ozone, the main component of smog. Ozone forms when the sun heats up vehicle exhaust, smokestack pollution, and emissions from gasoline and many other substances.

Even under the old standard, set in 1997, most of Massachusetts, with the exception of Bristol County and Nantucket, was in violation, according to the state Department of Environmental Protection. The new standard will place the entire state out of compliance. Fixing that will require a continuation of the vehicle-inspection and maintenance programs now under way, in addition to efforts to reduce emissions from solvents and paints. New measures, such as encouraging greater energy efficiency to reduce pollution by power generators, likely will be needed as well, according to DEP.

It's well worth the trouble and expense to gain improvements in respiratory health. Nationally, the EPA estimates that its new rule will prevent 1,300 to 3,500 premature deaths a year. A stricter rule favored by its Clean Air Scientific Advisory Committee would save as many as 9,200 lives a year.

Under current law, EPA can consider the cost of complying with a clean-air standard in setting a timeline of compliance, but not in deciding how stringent the rule should be. Memos leaked last week indicate that input from the bean counters in the budget office did affect the standard, although EPA administrator Stephen Johnson denies it.

Johnson did call recently for amending the Clean Air Act to allow the agency to weigh compliance costs in setting an antipollution rule. Congress should not give this proposal the time of day, and should instead call Johnson before it to explain just what role the White House played in his decision to allow higher smog levels than his own scientific advisers recommended.

Source - boston.com