EMISSIONS FROM 200 000 VEHICLES - A REMOTE-SENSING STUDY

We have a device capable of remotely monitoring the mass emissions of CO and HC from passing vehicles in gm/l of fuel used in under 1 s/vehi cle. The results from measuring the emissions of over 200 000 vehicles using this device show that a few vehicles, typically less than 10% o f the fleet, are responsible for half the total emissions. This 10% of the fleet are referred to as 'gross polluters'. The majority of gross polluters in the USA have had their emissions control systems tampere d with despite laws to the contrary. Results from the USA, Canada, Mex ico, the UK, and Sweden show that the USA imposition of emission contr ols has achieved a 50% reduction in fleet emissions, but for fleets ev erywhere, proper identification, diagnosis, and repair of gross pollut ers is the low-cost key to future emissions reductions.