Facilitate access to information on the health effects of indoor and outdoor air pollution and methods for reducing the risk. Conduct health impact assessments to determine the magnitude of the health effects associated with changes in air pollution. This information can be used to identify cost- effective measures to improve public health, identify critical uncertainties and suggest productive areas of research. Facilitate country actions to strengthen air quality management. National governments have the responsibility to set needed policies and laws and implement them. Air pollution control regulations—especially those phasing out the use of leaded gasoline, controlling pollution from.