Abstract
The Metro underground transport system moves more than 8 million people daily across Mexico city. The Metro is the most popular mass transport system. The average time a traveller remains inside the underground stations and tunnels is more than two hours. The airborne radon levels were measured, during the three months of summer, at 20 different stations, including the more deeply located halls. Stations were in different zones of the city. The radon concentration in underground corridors and stations varied from 60 Bq.m-3 to 350 Bq.m-3. The environmental factors, such as outside temperature, humidity, and days of rain were compiled in order to understand radon entry and transport better. Travellers inside the metro system are, of course exposed to airborne contaminants from several other sources.
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