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Objectives: The objectives of this study were to determine BLLs with a LeadCare II analyzer in children living in Ulaanbaatar, Mongolia and to identify potential risk factors influencing their BLLs with a lifestyle and residential environment questionnaire. Methods: A total of 153 children aged 6-8 years old were tested in 2014. Results: The geometric mean BLL was 5.3 µg/dL (95% CI: 4.9 – 5.7 µg/dL) and 69.3% of the children had blood lead levels ≥5 μg/dL (the United States Centers for Disease Control and Prevention’s current reference level). Factors that were significant (p