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Blue Baby Syndrome
There are limits on nitrate concentration in the water supply (45-50mg/L limit) due to associations with infantile methaemoglobinaemia, a condition known as 'blue baby syndrome' which rarely occured below 44mg/L. *
The IARC named nitrates and nitrites in processed meat as a carcinogen in 2015 using weak observational data. That controversial ruling has been questioned in recent years by many scientific researchers who argue that the carcinogen label should be reconsidered and that the current risk of cancer from nitrates or nitrites in processed meat is very small to non-existent. *
