Studies from South India, while showing a high prevalence of vDD, have consistently reported higher mean serum 25(oH) D levels than those observed in north India. Harinarayan et al reported vitamin D level of 14.6±7 and 20.85±8.63 ng/ml in postmenopausal women in the age group of 50-67 years.3,5 The present study was carried out at a latitude of 28.35° whereas study from south was done at latitude of 12.55° and 13.4°,3 which may explain the difference in serum 25(OH)D levels at these two sites. An additional contributor to the low serum 25(oH)D levels in Delhi is the atmospheric pollution. In an earlier study, Agarwal et al17 have shown a significantly higher level of serum 25(OH) D levels in infants from an area of lower atmospheric pollution compared to their peers from Delhi.