Which pollutant in water causes Blue baby syndrome?

Blue baby syndrome is primarily caused by high levels of nitrate in drinking water. When infants consume water with elevated nitrate levels, it can lead to methemoglobinemia, a condition where hemoglobin is unable to effectively carry oxygen, resulting in a bluish tint to the skin. This is especially dangerous for babies under six months old, as their digestive systems are more susceptible to converting nitrate to nitrite. Proper monitoring and treatment of water sources are essential to prevent this health risk.