Is lead a major air pollutant measured by air quality index?

Yes, lead is considered a major air pollutant and is included in the air quality index (AQI) in some regions. It is primarily emitted from industrial processes and the use of leaded fuels, although its levels have significantly decreased due to regulations. High levels of lead in the air can pose serious health risks, particularly to children, affecting their cognitive development and overall health. Monitoring lead levels is important for public health and environmental protection.