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3-6 μg/m . The limit of detection for 1-NA is 81 pg/ml and for 2-NA - 80.6 pg/ml. The method is characterized by good precision and accuracy; it meets the requirements of European Standard PN-EN 482 and can be used by occupational hygiene laboratories to measure the level of 1-NA and 2-NA and its salts in workplace air to assess workers' exposure to these substances. Med Pr. 2021;72(2)145-54. The method is characterized by good precision and accuracy; it meets the requirements of European Standard PN-EN 482 and can be used by occupation