The Law sets electromagnetical radiation limits to ensure that equipment and measurements at the observatories are not corrupted.
The installation and operation of radiocommunications stations are regulated, with a power flux density limit of W/m2 in force over the observatories of the Instituto de Astrofísica de Canarias.
Power flux density for any frequency must not be greater than 2x10-6 W/m2 in any part of the observatories, equivalent to an electric field intensity of 88.8 dB (mV/m).
In order to control radioelectrical pollution, agreement has been reached with the Secretary General of Telecommunications for regular radiofrequency background testing at both of the observatories. Continuous radioelectricity monitoring equipment is in use at the Observatorio del Teide.
Results of the most recent tests carried out by the Inspección General de Telecomunicaciones (2005)