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The EPA mandated last week that diesel trucks and buses must be manufactured with dashboard lights that signal when emission control systems malfunction. This national ruling follows a California state ruling three months ago requiring the same warning.
Before now, there has been very little to help the enforcement of pollution limits in trucks and buses, so this small step towards pollution monitoring is a very important one. Even better news is that California has a lower threshold for emissions than the national limit, and it's expected that all warning systems will be built around the lower limit so that they can be used in any state.
The EPA was given permission to publish the rule without a final White House review since the administration was busy with "other things" in their final days. The rule has become a single glimmer in a pile of environmentally-unfriendly eleventh-hour rules.
via Washington Post
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And surely this would be more important for non-diesel engines, which are less efficient (and therefore create more emissions) than diesel.