Emission inventory highlights Shell's impact on air quality

Over 20% of Merseyside's emissions of 1,3-butadiene - a carcinogen normally linked with traffic emissions - stem from a Shell oil refinery. The case illustrates the value of emission inventories in identifying industrial sources that may threaten compliance with air quality standards.

1,3-butadiene is a genotoxic carcinogen for which there is no known safe level of exposure (ENDS Report 238, p 8 ). The Government has proposed an air quality standard (AQS) of 1ppb expressed as a running annual mean, to be achieved by 2005. In general, vehicles are by far the main source of the pollutant - althou

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