This article is from the comp.sys.ibm.pc.hardware.video Frequently Asked Questions, by Michael Scott with numerous contributions by others. (v1.0).
Generally, low emission monitors follow the Swedish government's SWEDAC (Swedish Board for Technical Accreditation) MPR II spec's or the stricter TCO (Swedish Confederation of Professional Employees) standards.
Both limit the emissions of VLF (Very Low Frequency) and ELF (Extremely Low Frequency) electric and magnetic fields. Although new monitor technology generates less radiation than older units, additional active and passive shielding mechanisms are installed to further reduce emissions. The majority of monitors produced now fall within the MPR II spec's, though some still do not. The price differential between regular and low- emission units has declined substantially.
The basic specs are as follows: [From www.noradcorp.com/swedish.htm]
Frequency Range MPR II TCOElectric Fields
Static Field +/-500 V +/-500 V ELF 5 Hz - 2 KHz (Band I)
 
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