The content of nitrites and nitrates in whole milk powder in different regions of Poland was studied. The results obtained depended both on the factory from which the samples originated and on the season of the year. In 34.2% of the samples there was a very low level of nitrates and nitrites (below acceptable level for whole milk powder served to production of modified milk and modified infant formulas). In 64.1% of the samples the level was in accordance with the national standards and in 1.7% of the samples slightly over the limit. 99.2% of the samples were in accordance with the foreign standards.