Ohn walke supports government regulation as the most effective approach for reducing air pollution. which of the following statements expresses one of his reasons? john walke supports government regulation as the most effective approach for reducing air pollution. which of the following statements expresses one of his reasons? the origins of air pollutants are generally known. health risks of air pollution are linked to short-term exposure to high concentrations of pollution. air pollution remains concentrated at its source. there is little or no economic incentive for polluters to pay pollution costs.