Abstract
In June 1997, after two years of scientific inquiry and vigorous debate, the Ozone Transport Assessment Group (OTAG) presented its findings and recommendations. It found that Midwestern states of the USA are contributing to the smog problems of surrounding states. It used sophisticated modelling to investigate the problem of air pollution transport across the USA. The findings will determine how the Environment Protection Agency (EPA) will set nitrogen oxides (NOx) emission limits in the eastern half of the USA. These limits are designed to make all US states comply with the new ground ozone standard by 2007. To control mobile emission sources, OTAG recommended the mandatory sale of cleaner burning reformulated petrol in all 37 OTAG states, and supported a US-wide programme to sell low-emission vehicles. OTAG also proposed that by 1999 the EPA should evaluate the emission benefits and other effects of octane adjustments on current technology diesel engines, and develop emission standards.
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