Posts Tagged ‘air pollution’
Common Road Dust Is A Lot More Than Merely A Annoyance To The Ones That Have Allergic Reactions
Most Americans are not fully attentive to the road dust problem that exists across the nation. This dust is of a new makeup from what’s found around in most houses. The dust that builds-up around on the furnishings is made up of some dirt particles, but its main component is dead human skin cells that have fallen from the occupants in the home.
For any particle to be considered dust, it needs to be lesser than five hundred micrometers in size. This is exactly why HEPA filters are used on vacuum cleaners and as a part of the HVAC units inside the people’s homes, they trap 99.97% of all particles which are 0.03 micrometers in size.
Nuisance airborne dirt and dust from your roads has a completely different composition and source. This dust is formed when the soil is disrupted and made airborne from wind or perhaps a passing automobile, pollution in the air, as well as occasional volcanic dust that lingers around within the atmosphere.
There is little anybody can do about the volcanic dust problem. The source of the pollutant dust is the very best place to regulate that problem source, and road dust is controlled by economical means. The reason this really is so important is the specific makeup of the dust that may be kicked up whenever a vehicle passes over any road in America. In 1999, a study was performed by Ann Miguel, PhD. and Glen Cass, PhD. with the Environmental Engineering Science Department at Caltech in Pasadena that calculated the hazards from dust particles by the roads. They discovered that over 20 diverse sources of allergens were at hand on paved roads alone that exacerbated, or could actually produce, hypersensitivity in people.
The Federal Highway Administration of America has reported there are over 3.9 million miles of roads across our nation of which 70% is unpaved. The dust and debris from these surfaces can contribute up to 10 million tonnes of airborne substance in the form of dust every year, in accordance with the 1997 National Air Quality and Emissions Trends Report conducted by the EPA. The spreading of this airborne nuisance dust had previously been considered by the US Forestry Service. They estimated that for every vehicle that traveled only one mile down an unpaved road regularly for a year would place 1 tonne of said dust into the air that may cover an area round the road up to 500 feet.
Common earlier road dust control measures involved wetting the roads down with water. It’s an efficient but brief solution that is still used these days. Since nuisance dust is becoming a greater worry, better road dust products are being developed. These include the use of surfactants that last longer than water, but continue to be just a quick temporary fix. Adhesives are used in some cases to bind the dust to the surface and seal it. An example of this type of product is tree sap or lignin sulfonate. Chlorinated salts are helpful in keeping the humidity level set to help reduce the possibility of pollution particles becoming airborne from the sheer weight of themselves.
Road dust is a lot more than merely a nuisance to folks that have allergen hypersensitivity, and products to regulate it are being developed and improved to fulfill this need on never-ending basis.
