For calculation of the indices, fixed minimum and maximum values were established by UNDP for each of these dimensions. Performance in each dimension was expressed as a value between 0 and 1 by applying the following general formula:variation in arsenic pollution free and arsenic pollution affected HDI, mouza-wise total literacy rate, per capita income data and mouza-wise arsenic pollution free and arsenic pollution affected life expectancy values were calculated. Per capita income data and arsenic pollution free life expectancy values were considered to be same for all mouzas due to unavailability of adequate data.