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AIRBORNE PARTICLE ANALYSIS METHODS
ALLERGEN TESTS for BUILDINGS
ASBESTOS IDENTIFICATION IN BUILDINGS
BACKDRAFTING HEATING EQUIPMENT
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BOOKSTORE - ENVIRONMENTAL
CADMIUM in the HOME
CARBON MONOXIDE - CO
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CAT DANDER in BUILDINGS
CELL PHONE RADIATION
CHEMICAL CONTAMINANTS in WATER
COMBUSTION PRODUCTS & IAQ
DIRECTORY of MOLD / ENVIRONMENTAL EXPERTS
DUST SAMPLING PROCEDURE
EMERGENCY RESPONSE, IAQ, GAS, MOLD
EMF ELECTROMAGNETIC FIELDSRE
ENDOCRINE DISRUPTERS at BUILDINGS
FLOOD DAMAGE ASSESSMENT, SAFETY & CLEANUP
FLOOR TILE ASBESTOS IDENTIFICATION
FUNGICIDAL SPRAY & SEALANT USE
GAS EXPOSURE EFFECTS, TOXIC
HEATING OIL EXPOSURE HAZARDS, LIMITS
HOUSE DUST ANALYSIS
HOUSE DUST COMPONENTS
HUMIDITY CONTROL & TARGETS INDOORS
INDOOR AIR QUALITY IMPROVEMENT GUIDE
LAB PROCEDURES MICROSCOPE TECHNIQUES
LEAD POISONING HAZARDS GUIDE
LEGIONELLA LEGIONNAIRES' DISEASE
LIGHT, GUIDE to FORENSIC USE
METHANE GAS SOURCES
MILDEW in BUILDINGS ?
MOISTURE CONTROL in BUILDINGS
MOLD ACTION GUIDE - WHAT TO DO ABOUT MOLD
MOLD CONSULTANTS / INSPECTORS
MOLD DETECTION & INSPECTION GUIDE
MOLD / ENVIRONMENTAL EXPERT, HIRE ?
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MSDS MATERIAL SAFETY DATA SHEETS
MVOCs & MOLDY MUSTY ODORS
NOISE / SOUND DIAGNOSIS & CURE
ODORS GASES SMELLS, DIAGNOSIS & CURE
OIL, HEATING, EXPOSURE HAZARDS, LIMITS
OIL HEAT ODORS & NOISES
OIL SPILL CLEANUP / PREVENTION
PET ALLERGENS / PET DANDER
PET STAINS & MARKS in BUILDINGS
PLASTIC ODORS-SCREENS, SIDING
PLUMBING SYSTEM ODORS
PVC - VINYL BUILDING PRODUCTS
RADON HAZARD TESTS & MITIGATION
SAFETY HAZARDS GUIDE
SAFETY HAZARDS & INSPECTIONS
METHANE GAS HAZARDS
SEPTIC SYSTEM ODORS
SEWAGE BACKUP TEST & CLEANUP
SEWER GAS ODORS
SMELL PATCH TEST to FIND ODOR SOURCE
STAIN DIAGNOSIS on BUILDING EXTERIORS
STAIN DIAGNOSIS on BUILDING INTERIORS
SULPHUR & SEWER GAS SMELL SOURCES
UFFI UREA FORMALDEHYDE FOAM INSULATION
URETHANE FOAM Deterioration, Outgassing
VINYL CHLORIDE HEALTH INFO
VOCs VOLATILE ORGANIC COMPOUNDS
WATER ODORS, CAUSE CURE
This article describes the identification & measurement of local outdoor or indoor EMF electromagnetic field sources as part of a recommended procedure for performing electromagnetic field (EMF) or electro-magnetic radiation EMR measurements in gauss or milligauss.
We discusses sources of error and variation in EMF measurements and we review and make suggestions for using several low-cost EMF measurement devices to determine the instantaneous electromagnetic field exposure.
We describe the identification & measurement of local outdoor or indoor EMF electromagnetic field sources as part of a recommended procedure for performing electromagnetic field (EMF) or electro-magnetic radiation EMR measurements in gauss or milligauss.
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Other sources of electromagnetic fields may be greater than a power transmission line, may confuse readings, and might in some cases deserve attention.
However remember that the field strength falls off as the square of the distance from the source.
And remember that an appliance generates a field when it's electrically active or "turned on."
So unless your toaster is running 24-hours a day, and unless you're sleeping with your head next to the toaster, the fact that it generates an electrical field (while you're making toast) is, from an EMF health exposure view, pretty unimportant.
We conclude that power-company funded studies which focus attention on home appliances are simply funding a red herring to distract already-frightened consumers, but we also emphasize that in most cases the fear that some people have about EMF exposure is not appropriate and that other more dangerous hazards may be present.
Occupants who wish to take the EPA's advice of "prudent avoidance" (that means avoid without going to extreme measures and without panic), might use their new EMF meter to look at the following cases:
Moving even three or four feet away from this line usually reduces the measurable EMF field strength from the electrical service entry cable to below the range of detection.
we have found exceptions to that rule where metal building piping or steel beams (or in one case sewer piping) appear to carry EMF to other locations more distant from the source.
Some studies by some experts have suggested a possible link between exposure to electromagnetic fields and various cancers or other health problems. Other studies suggest that no definite correlation could be demonstrated. It is likely that the jury will be out on this matter for some time, for both economic and political reasons.
Our photo shows an uncommon exposure to an electrical field: the electrical meter and service entry cable produce a field which can be detected up to perhaps two to four feet away. But the history of construction at a building can bring surprises.
An outside porch first enclosed this electrical meter; later the porch was enclosed and converted to a bedroom. Our model shows that someone sleeping on the side of the bed next to the electrical meter was likely to be sleeping in an EMF that could easily have been avoided: move the bed to an opposite wall.
Small absolute health risk from EMF: Most researchers indicate that where a risk is present, the absolute risk level from EMF is likely to be small, and less than other less obscure hazards. (Automobile accidents, trip and fall, fire, and shock hazards, smoking and other health risks.) Consumers should not let focus on a specific emotionally-charged hazard distract them from these other more mundane but more dangerous concerns.
Often but not always, the relative strength of such fields falls off in much shorter distance than that from power transmission facilities. However in some instances where occupants wish to maintain prudent avoidance, it is possible to make a significant reduction in exposure by small changes in arrangement of devices or locations of working or sleeping areas.
Continue reading at EMF MEASUREMENT DISTANCE AFFECTS STRENGTH or select a topic from the More Reading links shown below.
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