Air Quality Standards To establish ambient air quality standards Physical/chemical/biological analysis; ■Animal experiments, Short-term exposure of human volunteers(observe measurable,irreversible short-term or long-term effects); Epidemiology Air Quality Standards To establish ambient air quality standards  Physical/chemical/biological analysis;  Animal experiments;  Short-term exposure of human volunteers (observe measurable, irreversible short-term or long-term effects);  Epidemiology