Airborne lead concentrations in the central reservation of the M4 motorway at Harlington have been measured from 1971 to 1983. This report gives the average concentrations for the period 1980 to 1983 and compares them with those for the earlier years. Concentrations have remained fairly constant since 1977, reflecting the relative stability in traffic flow on the motorway and in the average lead content of petrol during the same period. (A)

Want to know more about this project?