Question in U.S. Diesel Emission Standards

  • Thread starter Thread starter Su Solberg
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SUMMARY

The discussion clarifies the distinctions between "Tier," "EPA," and "California" emissions standards in the U.S., emphasizing that "Tier" and "EPA" are synonymous. The conversation also highlights that while on-road and off-road standards share similar allowable pollutant concentrations, they differ in introduction dates and calculation methods. Specifically, the Tier 4 emissions level is currently relevant for industrial applications, whereas automotive standards were established earlier.

PREREQUISITES
  • Understanding of U.S. emissions standards terminology
  • Familiarity with Tier 4 emissions regulations
  • Knowledge of EPA and CARB (California Air Resources Board) roles
  • Awareness of differences between on-road and off-road vehicle emissions
NEXT STEPS
  • Research the specifics of Tier 4 emissions regulations
  • Explore the role of CARB in California emissions standards
  • Investigate the historical introduction dates of U.S. emissions standards
  • Learn about the calculation methods for on-road vs. off-road emissions
USEFUL FOR

Environmental engineers, regulatory compliance specialists, and professionals involved in vehicle emissions testing and compliance will benefit from this discussion.

Su Solberg
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I wonder is what are the legal and application area difference between "Tier","EPA" and "California" Emission Standard in U.S (I am not asking the allowable emission levels).

Also, Is there any difference in on-road and off-road standads(again, I am not asking the emission levels)?

Thanks for your kind help in advence.
 
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The EPA set emissions levels by "Tier" (e.g. "this Tier 4 level the EPA have set is a right bastard!"). The two are synonymous. Don't know about CARB, I'll do some reading at work and let you know later in the week.

On and off-road standards (for EPA and EU) are broadly the same in terms of allowable pollutant concentrations, but do differ in introduction dates, and (depending on application) the way the figures are calculated. That is to say, we (industrial) are currently developing to meet Tier 4 emissions levels but the automotive guys did this a while back.
 

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