Question

what is the most probably scientific explanation behind the Euro 4 standards having "no limit" on the particular matter (PM) Emmited by vehicles that run on petrol
a) Petrol vehicle did not emit PM
b) PM Emmited by petrol vehicles was less harmful than diesel vehicles
c) PM from petrol vehicles was not likely to have harmful effects
d) Car manufacturers had designed petrol engines that did not emit PM .​

Answer 1

Answer:

correct answer

is option b )