91ÌÒÉ«

91ÌÒÉ« in the development of air pollution modelling, monitoring, and emissions inventories are needed for a variety of purposes, including: regulatory compliance, exposure assessment, identification of hazardous jobs or tasks, understanding chemical and physical properties of pollutants, informing the public, assessing effectiveness of control measures, predicting impacts of policies, apportioning chemical constituents to their sources, and assessing health effects.