European air pollution rules for diesel machines such as bulldozers, excavators and barges are much more lax than those for cars and lorries. As well as this, some engine types and older machines are excluded from air pollution law. This is a problem because, according to the World Health Organisation (WHO), diesel exhaust is carcinogenic. Ambitious, comprehensive and consistent rules are needed to limit air pollution emissions from non-road mobile machinery (NRMM - diesel machines). These are required to address the growing urban air pollution that Europe faces. T&E believes that future EU legislation on diesel machines must be in line with emissions limits for equivalent road vehicles.