Quote:
Originally Posted by cRiPpLe_rOoStEr
An increase to NOx emissions is still often pointed out as easier to mitigate on a gasser fitted with direct injection than on a Diesel, yet the PM is a real PITA for both. OTOH a gaseous fuel injected at the vapour phase, such as natural gas, won't be so troublesome regarding PM.
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PM has the same solution for gas and diesel - particulate filters. Natural Gas has the benefit of not requiring a particulate filter but the downside of needing super expensive fuel tanks that cost way more than a PM filter.