With the recent news that Hamburg will be the first German city to ban older diesel engines, coupled with a flood of 'dirty diesel' media coverage over recent years, it's understandable that customers have been prompted to think cautiously about diesel when considering a new motorhome. But, there is an important distinction to be made between 'dirty' diesel engines and cleaner diesel engines in new motorhomes; a difference that prospective buyers can benefit from knowing. Older diesel engines, i.e. those that were built before the Euro 4 standard in 2005 are those considered to be the most harmful to the environment and are commonly referred to as 'dirty'. Conversely, new motorhomes are fitted with diesel engines that comply with the new European Commission standards of Euro 5 and Euro 6, introduced in 2009 and 2014, respectively, with the aim of reducing harmful levels of exhaust emissions from both petrol and diesel engines. Both Euro 5 and Euro 6 are fitted with particulate filters and Euro 6 engines have emissions control technology that converts up to 99% of combustion engine exhaust pollutants and particulates.