Composition of Dust Particles and Particulate Matter in The Air

Composition of Dust Particles and Particulate Matter in The Air

When I test for PM2.5 and PM10 which are Fine Particle and Coarse Particle designations used by the EPA, I am often asked what is the nature of this particulate matter. These may also be referred to as TSP (Total Suspended Particulate) or RSP (Respirable Suspended Particulate) matter. While it is very difficult to tell exactly what it is without microscopic analysis and will vary depending on the environment, an educated guess can be made based on what sources are nearby and the potential contribution of those sources based on typical size regimes.

Possible sources are pollen, toxic mold spores, smoke, bacteria, pet dander, construction dust, etc.

There are some useful reference charts that not only talk about the ranges of certain pollutants, but also give an indication of different filtration mediums which are relatively effective in removing these contaminants.

 

Particulate Matter in Air Quality

Air Filtration with Regard to Particle Size

 

*NOTE 1 – HEPA (High Efficiency Particulate Air) filters are typically rated at 99.97% efficiency for particles of 0.3 um or larger. At this time, I am not sure that a HEPA filter will remove more than 95% of particles which are 0.01 microns in size as this chart seems to imply.

Also, beware of filters and vacuum cleaners which claim to be “HEPA-like”, “HEPA-type” or “99% HEPA” as these are not true HEPA filters and are often inferior in quality with regard to air filtration efficiency.

*NOTE 2 -The term DS efficiency mentioned in the Pleated Filter (40% DS ) refers to Atmospheric Dust Spot Efficiency which measures how well a filter removes staining dust from the air.

 

HEPA Air Filtration Particle Ranges

   HEPA Filtration Particle Chart

 

Particle Filtration Size Chart HEPA vs. ULPA

Particle Filtration Size Chart HEPA vs. ULPA

 

Characteristics of Particles and Particle Dispersoids

Characteristics of Particles and Particle Dispersoids

This is a fairly technical diagram for reference use on airborne particle characteristics.

 

Origin of Dust Particulate Matter

Origin of Dust Particulate Matter

 


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ScanTech Technical Consulting is owned and operated by Joel-Anthony Gray who has over 22 years of experience as an EMF consultant, EMI troubleshooting expert and nuclear radiation testing consultant for a variety of commercial and industrial customers. While there is currently no such thing as a Certified EMF Consultant as far as the United States industrial and scientific community at large is concerned, what ScanTech offers is extensive education, experience and multiple certifications in non-ionizing radiation, industrial safety and hygiene. (listed here EMF Credentials) He holds numerous degrees and certifications which qualify him for this level of expertise. Call 214.912.4691

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ScanTech Technical Consulting professional commercial electromagnetic field testing and radio frequency testing in the Dallas – Fort Worth Texas area to detect and measure exposures and health risks (if any) to electromagnetic fields and radiation. Call 214.912.4691

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