toxicity

Robert McClure's picture

New studies: Toxic asphalt sealants threaten kids, cause air pollution

When you think of pollution, you might picture an industrial center like Camden, N.J., or Jersey City. But new research shows that when it comes to a potent class of cancer-causing toxic chemicals, many American parking lots are a lot worse.

New studies paint an increasingly alarming picture – particularly for young children – about how these chemicals are being spread across big swaths of American cities and suburbs by what may seem an unlikely source – a type of asphalt sealer. These sealants are derived from an industrial waste, coal tar.

Four new studies announced this week further implicate coal tar-based asphalt sealants as likely health risks.  The creosote-like material typically is sprayed onto parking lots and driveways in an effort to preserve the asphalt. It also gives the pavement a dark black coloring that many people find attractive.

Coal tar is a byproduct of the steelmaking industry. In 1992, the U.S. Environmental Protection Agency declared that it would not be classified as a hazardous waste, even though it met the characteristics of one, because it could be recycled for uses including coating asphalt. That meant steel mills didn’t have to pay for costly landfilling or incineration of the waste.

 Only in recent years have scientists discovered the ill effects of this practice.

Coal tar sealants are used most heavily in the eastern United States, but have been used in all 50 states until Washington State banned the products last year as a result of reporting by InvestigateWest. More than a dozen local governments, including Washington, D.C., and Austin, Texas, also have banned the coal tar sealants in favor of the other major type of sealant, which is asphalt-based.

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New study shows Roundup pesticide kills fish; U.S. heading toward OKing more 'Roundup-Ready' genetically engineered farm acreage

Roundup is one of the most widely used pesticides in the world. But it increases the incidence of disease in fish, a new study shows. And yet it looks like the government is about to greatly expand the U.S. acreage where it is applied by approving planting of vast swaths of genetically engineered alfalfa. These “Roundup-Ready” hayfields worry opponents of GE foods, and this latest news about the effect on fish is bound to stir the pot some more. (The opportunity for public comment on allowing GE alfalfa ends soon, btw.)

The new fish study, out of New Zealand, showed that when applied at recommended rates on fields near a freshwater stream, Roundup didn’t kill young freshwater fish outright. Score one point for Monsanto, Roundup’s manufacturer.

However, what Roundup did at this relatively dilute concentration was to increase the production of worm that’s a parasite of the fish, and comes from a particular snail. And the combination of more parasites and moderate levels of Roundup – aka “glyphosate” – produced what scientists called “significantly reduced fish survival.” They concluded:

"This is the first study to show that parasites and glyphosate can act synergistically on aquatic vertebrates at environmentally relevant concentrations, and that glyphosate might increase the risk of disease in fish. Our results have important implications when identifying risks to aquatic communities and suggest that threshold levels of glyphosate currently set by regulatory authorities do not adequately protect freshwater systems."