NEWS New emission test will increase car inspection times ADVICE What is the “cat” in a car? FEATURES 3M Vehicle Air Purifier Plus NEWS New surveillance cameras detect smoky vehicles NEWS Bargains up, but car stocks down as stricter emission standards loom NEWS Car dealers gearing up for stricter Euro 6 emission standards ADVICE What causes smoke from exhaust pipes? FEATURES The drive for cleaner air NEWS Vehicle carbon emissions scheme under review FEATURES Lies and fuel economy figures