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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I don't know sorry
sorry so sorry
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