What is the most probable scientific explanation behind the Euro 4 standards having no limit on the particulate matter (PM) emitted by vehicles that run on petrol ? Option a.) Petrol vehicles did not emit PM. Option b.) PM emitted by petrol vehicles was less harmful than diesel vehicles. Option c.) PM from petrol vehicles was not likely to have harmful effects. Option d.) Car manufacturers had designed petrol engines that did not emit PM.
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The three measures common to both standards are carbon monoxide, total hydrocarbons and nitrogen oxide (NOx), while the new measure for Euro 5 is non-methane hydrocarbons. Under Euro 4, a motorcycle could emit no more than 1140 mg/km of carbon monoxide, but this now drops to a maximum of just 1000 mg/km under Euro 5.
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