While most customers don't need to worry about exactly what the emissions standards are for their diesel vehicles, manufacturers and those keeping a strict eye on CO2 emissions do. For consumers, the upcoming stricter standards on diesel vehicles in the United States mean cleaner, more efficient cars. For manufacturers and engineers, it means figuring out how to stop the CO2 from getting into the air. How much CO2, you ask, well, that's what the Tier 2 regulations tell us (Tier 2 regulations apply to not only large vehicles, but also cars, minivans and light-duty trucks).
If you're interested in exactly how much CO2 is allowed to come out of the tailpipe of new diesel vehicles, DieselNet should be your source of information. Instead of duplicating what Dieselnet has done so well, I suggest you check out their site for charts of all the standards, recently updated.

[Source: Dieselnet]


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