The recognition of transport as a major source of air pollution grew steadily during the 1970s and 80s but the real changes started around 20 years ago. In 1992, guidance on the assessment of the air quality impacts of road schemes was introduced as part of the Design Manual for Roads and Bridges (DMRB). The Highways Agency was formed in 1994 and took forward DMRB assessments of new road schemes. New Euro emission standards were introduced for new vehicles from 1993, with catalytic converters...
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