[en] In view of the fact that radon and its daughter product are a major source of natural radiation exposure, the measurement of radon concentration in dwellings is assuming ever increasing importance. It is known from recent surveys in many countries that radon and its progeny contributes significantly to total inhalation dose and its fairly established that radon when inhaled in large quantity causes lung disorder. Keeping this in view, the indoor radon level monitoring were carried out in the dwellings of Ramehra, Nukhel, Gallot, Kheri, Ropa and Samurkhurd villages, using the Nuclear Track Etch (passive) technique. These villages are known to be located in the vicinity of radioactive sites of Himachal Pradesh. The radon concentration in the dwellings of some villages had been found to be varying from 300-900 Bq/m³. The radon concentration has been found to be not only varying with seasonal changes, but also with the mode of construction of houses, building material utilized and the ventilation conditions. The houses with mud floors shows quite higher radon as compared to the houses with brick flooring. Even the radon survey in the soil-gas and the dwellings has also been carried out using the Alpha-Guard (Active) technique, which is based on pulse ionization chamber. The soil-gas radon concentration shows a large variation from 1000 Bq/m³ to 75000 Bq/m³. The indoor radon concentrations levels which have been measured in the dwellings by the Alpha-Guard are quite different as compared to that measured in these dwellings by the Nuclear Track Etch technique (using the SSNTDs), indicating the importance of the SSNTDs in the long-term integrated measurement of radon levels in the dwellings. (author)