5. The costs caused by the adverse effects of pollutants on the health and welfare of the human population are Answers A. external costs. B. internal costs. C. equilibrium costs. D. private production costs. Question6. A company can legally increase the allowable air pollution output by one of its factories by Answers A. hiding it from the government. B. buying emission allowances from other companies. C. turning in some of its emission allowances to the government. D. increasing the size of the factory