Concentrations of Radon in Torrelodones Houses (image) FECYT - Spanish Foundation for Science and Technology Share Print E-Mail Caption This represents the concentrations of radon in Torrelodones houses. WHO recommends no more than 100 Bq/m3. Credit Sainz et al./ SINC Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.