摘要: An air pollution ecosystem is shown schematically in Figure 1. The size of the may be as small a village or large world. In all cases, atmosphere an integral component, transporting substances from sources to receptors and, on most occasions, diluting acceptable levels. Dispersion rates are so Open image new window variable place and time time, however, that meteorological part requires special study. Sometimes natural ventilation provided by very limited, quality deteriorates greatly. On other occasions mixes thoroughly through volume air.