According to the environment behavior of air pollutant and the way of emission,migration,transform,and absorbtion by human body of pollutants,a method of disability adjusted life years was established for final quantitative risk assessment of human body.Investigation in a Guangdong cement plant shows that NOx is the most harmful factor to human health,which amounts to 43.9% of total human risks caused by airborne pollutants and the SO2 is the smallest factor for the risks.