1.   From Los Angeles to Athens, city authorities have tried to enact measures to limit exhaust emissions.

2.   It could only be concluded that the cause of the intense eye irritation was in some way related to vehicle exhaust emissions.

3.   The exhaust emissions standards could only be met with current technology by installing three-way catalytic converters in petrol-driven vehicles.

4.   To improve fuel economy on short journeys and minimise the level of exhaust emissions, close attention has been paid to rapid engine warm-up.

5.   They are expected to halve pollution caused by large commercial vehicles, bringing them into line with regulations governing car exhaust emissions.

6.   Low-level ozone pollution is triggered by the action of sunlight on vehicle exhaust emissions, with still, sunny days providing the best conditions.

7.   The Moscow authorities have announced that checks are to be conducted on private and commercial vehicles for excessive exhaust emissions.

8.   Both platinum and palladium are used in catalytic converters, which remove pollutants from car exhaust emissions.