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From: David A Gabel, ENN 
Published October 6, 2011

How many different dust particles are you breathing?

In any given room, even the most sterile scientific clean rooms, there are dust particles in the air and coating every surface. If allowed to go uncleaned, the dust will accumulate to eventually cover every surface. But what exactly is the dust in the air and on our tables and shelves? A chemistry research team at the Ohio State University, using a new kind of sensor, has isolated and measured the composition of unique dust particles in their laboratory.

Led by James Coe, professor of chemistry, the Ohio State University researchers identified 63 dust particles, each containing its own composition of ingredients. They found the most common ingredient of indoor dust was organic matter, originating from either a plant or animal. While not all specifically identified, this matter includes skin particles, dander, pollen, and many others.

The second-most common ingredient is quartz, also the second-most abundant mineral on Earth's crust after feldspar. Both quartz and organic matter were found in over half of all dust particles classified. Other ingredients found were man-made chemicals created from air pollution, fertilizers, and construction materials like gypsum.

The sensor utilized by Coe's research team has a metal mesh, in which particles get stuck. An infrared light is used to pick up the complex details in each dust grain. The mesh helps to separate particles by size which can isolate the ones small enough to enter people's lungs. The potential health care applications are enormous.

The sensor was originally built to create plasmons, mixtures of conducting electrons and photons. These boost the light intensity passing through the metal mesh, letting scientists record, in detail, the infrared light spectrum. Any material inserted in the sensor could be analyzed for its unique signature on the spectrum.

Then dust entered the sensor, clogging the mesh. The scientists then realized the sensor could be effectively used at analyzing airborne dust particles. Coe's students competed to analyze individual dust particles in the air, and found 63 overall. Their research has been published in the recent issue of The Journal of Physical Chemistry C.

Link to published article: http://pubs.acs.org/doi/abs/10.1021/jp205383h

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A Certified Environmental Hygienist is an environmental detective who is trained, certified, and experienced in the fields of mold and environmental hygiene, such as the environmental cleaning and disinfecting of indoor building air and surfaces like walls, ceilings, floors, heating/cooling equipment and ducts, counters, and equipment to prevent the spread of mold growth, infectious diseases, and other health problems caused by environmental exposure to germs, bacteria, viruses, and mold.

What is environmental hygiene?  Environmental hygiene includes services and actions aimed at improving or maintaining the standard of basic environmental conditions affecting the well being of people, including, but not limited to: (1) clean and safe water supply, (2) clean and safe ambient air, (3) efficient and safe animal, human, and industrial waste disposal, (4) protection of food from biological and chemical contaminants, and (5) adequate housing in clean and safe surroundings. (from http://www.businessdictionary.com)

Environmental Hygiene concentrates on environmental health threats and problems, such as microbial pollution and the spreading of infectious diseases in the environmental situation and facilities of workplaces, homes, condominiums, and apartments.

“Microbial pollution is a key element of indoor air pollution, and it is caused by hundreds of species of bacteria and fungi, in particular filamentous fungi (mould), growing indoors when sufficient moisture is available. Problems of indoor air quality are recognized as important risk factors for human health in both low-income and middle- and high-income countries. Indoor air is also important because populations spend a substantial fraction of time within buildings. In residences, day-care centres, retirement homes and other special environments, indoor air pollution affects population groups that are particularly vulnerable due to their health status or age. Microbial pollution involves hundreds of species of bacteria and fungi that grow indoors when sufficient moisture is available. Exposure to microbial contaminants is clinically associated with respiratory symptoms, allergies, asthma and immunological reactions” noted the the World Health Organization in its report “WHO Guidelines for Indoor Air Quality: Dampness and Mould,” published July 16, 2009

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