For each compliance date the regulation requires fleets with more than 500 hp determine if the fleet meets a fleet average emission target rate for that date. The first compliance date is different depending on fleet size:
The fleets must meet progressively lower targets each subsequent year until the final target rate is achieved.
ARB has a calculator that generates the fleet average emission rates given basic engine model year and hp data. For the latest calculator see:
While ARB does have a calculator it is important to understand how the fleet average emission rates are calculated. The in-use fleet average emission rates are calculated as follows.
|Type of VDECS Installed||VDECS Factor|
|No VDECS Installed or Level 1 VDECS||1|
|Level 2 PM VDECS, not highest level||0.82|
|Level 2 PM VDECS, not highest level, with NOx Reduction||1 minus (0.18+(verified % NOx reduction divided by 170)|
|Highest Level PM VDECS||0.7|
|Highest Level PM VDECS with NOx Reduction||1 minus (0.3 + rerified % NOx reduction divided by 170)|
|NOx Reduction only||1 minus (verfied NOx reduction dividied by 170)|
Note that unless you change the equipment in your fleet or add some type of VDECS your fleet average emission rate will not change.
To calculate your fleet average emission target:
Note that permanent low use, and year-by-year low use vehicles are excluded from the calculations. For details on these exemptions click on the box "Permanent and Year-By-Year Low Use Equipment" in the compliance chart.