Decline of Air Pollution, Rising Abatement Costs

U.S. manufacturers have been highly successful in reducing pollution over the past two decades, yet their costs to shrink their environmental footprint continue to grow. They're being affected by the law of marginal returns and each new pollution regulation that EPA devises will be increasingly more costly to implement.

Two recent studies help bear this out. In one, the MAPI Foundation compared pollution abatement costs among manufacturers around the world and found that U.S. manufacturers have the highest bill -- roughly double that of Japan, three times as much as Germany, and about six times as much as Canada and Korea. MAPI Foundation Chief Economist Dan Meckstroth's analysis, which examined air pollution, greenhouse gases, waste disposal, and wastewater treatment, showed that U.S. manufacturers spend roughly $25 billion annually in pollution abatement costs, the highest for any country in the world. This amounts to about 1.2% of manufacturing value-added, comparable to what manufacturers experience in most other advanced economies, where strict regulations have also increased business costs. (Canada's manufacturers pay the most as a percentage of manufacturing GDP, at 2.2%, primarily because of the nation's preponderance of waste- and wastewater-intensive industries, such as pulp and paper, steel, and petroleum refining. Mexico's manufacturers pay the least, at 0.8%.)


When looking at air pollution abatement -- including the reduction of nitrogen oxides (NOx), sulfur dioxide (SO2) and particulate matter (PM) -- U.S. manufacturers spend $5.3 billion annually, more than the other eight countries in the study combined. As a percentage of manufacturing value-added, this amounts to 0.27%, which is higher than every other country except Canada.

Another study demonstrates U.S. manufacturers' resounding success in reducing their air pollution. Georgetown economist Arik Levinson shows that between 1990 and 2008, U.S. factory air emissions fell by two-thirds, even as the real value of manufacturing output grew by 35%. Dr. Levinson observed that advances in production techniques led to more than 90% of this cleanup.

This accords with a 2013 report by the U.S. Energy Information Administration that shows dramatic reductions in air pollutants from electric power plants over the past two decades. Two pollutants in particular, SO2 and NOx emissions, fell dramatically -- from about 16 million short tons of SO2 and 6 million short tons of NOx in 1990 to about 3.4 million and 1.8 million, respectively, in 2012.

The 1990 Clean Air Act Amendments clearly incented industry to develop new technologies that have led to a far more efficient and cleaner manufacturing sector. So the question isn't one of effectiveness, it's one of efficiency -- that is, as we become a cleaner society, how do we reduce pollution without reducing U.S. manufacturers' competitiveness? It's a very relevant question: The law of diminishing returns tells us that as more resources are invested on a fixed resource, you'll eventually reach a point at which additional investments yield progressively smaller results. In pollution control this means it's becoming progressively more expensive for manufacturers to eliminate their remaining emissions.

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