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Originally Posted by JSH
PM has the same solution for gas and diesel - particulate filters.
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Which could be avoided on gassers had direct injection not been so increasingly common on them.
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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.
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Sure for an OEM it's easier to fit a particulate filter than working around a car to make it dedicated-CNG, and even some newer CNG-capable models available in Europe nowadays might retain a particulate filter as they retain the ability to run on gasoline. But the cost of CNG tanks has not been so much of an issue rendering conversions unsuitable in third-world countries.