EN
Nitrite and nitrate residues measured in veterinary laboratories and in the Department of Hygiene of Food of Animal Origin, National Veterinary Research Institute are summarised. Measurements were done according to Polish Standards. Mean nitrate and nitrite concentrations (13380 samples) ranged from 15.0 ± 10.6 to 49.9 ± 71.0 μg/kg, and from 15.5 ± 15.5 to 64.1 ± 38.7 μg/kg, respectively. The residue limit (125 mg/kg) was exceeded in 3.3% of examined samples.