1. A gallon of gasoline weights about 6 pounds. Yet combustion of that gallon yields nearly 20 pounds of CO2. How it that possible? 2. Why is CO harmful to human health? 3. Explain the difference between primary and secondary air-quality standards. 4. Acid rain is a big problem in the northeastern United States, northern Europe, and eastern China. Why those places? 5. What's the purpose of an automobile's catalytic converter? 6. What coal pollutant is generally removed by scrubbing? Why won't filters work in this pollutant? 7. Why do coal-burning power plants emit radiation