When a with/without analysis reveals increased levels of ambient air quality, we can be assured that the amount of money spent on air pollution control bought the highest possible impact. That the air should be removed from the planet and cleaned. that we would have better air quality without the policy. @ that the change in air quality is a result of the policy. New source bias is defined as D not allowing old sources to increase production so that new sources can enter the market. B holding new sources of pollution to stricter standards than existing sources. not allowing new sources into the industry for fear of increased emissions. holding older sources of pollution to stricter standards than new sources