Abstract
This paper uses spatial exploratory data analysis and spatial econometrics to analyze the regional transport of air pollution. According to my results, precursor emissions from up to 1000 km away from a variety of directions can have significant effects on ozone air quality, though the effect is not always negative, and although neither the sign nor the significance of the effect is constant over time. NOx emissions from West Virginia and Ohio appear to increase the 90th percentile ozone concentration in a number of other states. Non-monotonicities in ozone production may be a reason why the transport of NOx can sometimes be a positive externality rather than a negative one, and why a cap-and-trade program that reduces aggregate NOx emissions may not always reduce ozone.
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