[audio:http://wamcradio.org/EarthWise/wp-content/uploads/2013/01/EW-01-28-13-Toxic-Dust.mp3|titles=EW 01-28-13 Toxic Dust]
It’s well known that dust is a human health hazard. The U.S. Environmental Protection Agency regulates the emissions of particulate matter, which is essentially dust, from construction sites, power plants, dirt roads, automobile tailpipes and industry.
Regulations are based on the size and number of particles, not on their content. That’s because no matter what’s in dust, the microparticles that get into your lungs can cause cardiovascular problems.
Recently, scientists analyzed dust at a recreational area near Las Vegas. Surprisingly, they discovered it contained arsenic. Because there is no history of mining nearby, it was probably a natural component of the soil. Its discovery was disturbing because arsenic is extremely toxic and the area is frequented by dirt bikers and four-wheelers—who are kicking up and inhaling the toxic dust. Additionally, airborne dust can travel, meaning the arsenic-laden dust could affect the entire population of Las Vegas.
Even worse than arsenic is a mineral called erionite. It’s similar in structure to asbestos, and its brittle fibers can cause lung damage when inhaled. Extended exposure can lead to the lethal lung cancer known as mesothelioma. This cancer is prevalent in certain villages in Turkey where erionite is present. In the U.S., the mineral is found in thirteen states.
A new scientific field called Medical Geology is investigating the intersection of earth’s geology and human health. Because the world is getting dustier, it’s important to learn more about what is in dust and how its composition can affect our well-being.
Web Links
The Health Implications of Dust – CSA News
Photo, taken on November 16, 2009, courtesy of Alpha via Flickr.
Earth Wise is a production of WAMC Northeast Public Radio. Support for Earth Wise comes from the Cary Institute of Ecosystem Studies in Millbrook, NY, with partial support from the Field Day Foundation.