Atmospheric tritium activity is measured regularly around Narora Atomic Power Station (NAPS) since gaseous waste, which contains tritium, is being released through a 145 m high stack at NAPS site. Atmospheric data collected during 2004-2008 shows a large variation of  ³H concentration in air, fluctuating in the range of  £0.2-91.6 Bq ^-3. Si gnificantly, higher tritium levels were measured in samples near the site boundary (1.6 km) of NAPS compared to off-site locations. The atmospheric dilution factor was found to be in the range of 1.1 x 10^-7-7.3 x 10^-7  sm^- . The scavenging ratio of NAPS site was found to be varying from 0.2 x 104 to 14.1 x 104 (Bq m^-3 rain water per Bq m ^-3 air). The inhalation dose to a member of general public at different distances (1.6-30 km) from NAPS site was found to be ranged from 0.08-0.21 µSv year^-1.