To determine an engine’s emissions, an owner/operator may use:

1. Default SBCAPCD Diesel Engine Emission Factors – For use with older engines (see the first table presented below), or
2. USEPA emission standards for Tier 1 – 4 engines (see the second table presented below)

Default SBCAPCD Diesel Engine Emission Factors

basis: (1) USEPA AP-42, Table 3.3-1, (2) USEPA AP-42, Table 3.3-2, where S = wt  % of sulfur (eg, for S = 0.05 wt %: SOx = (3.67)*(0.05) = 0.183 g/bhp-hr.  Assume NMHC = ROC

USEPA Emission Standards for Tier 1 – 4 engines

Notes:

^a Nonroad CI Engine Emission Standards from Title 13, California Code of Regulations, Section 2423 (ARB Executive Order “Std”).

^b VHC = Total Hydrocarbons (THC) minus methane and ethane fractions.  Equivalent APCD standard. (Highlighted in Orange)  See Conversion Factors to Hydrocarbon Emission Components, Report No. NR-002a, US EPA, 5/2003.  {VHC = ROC}

^c Tier 2 and Tier 3 HC and NOx equivalent standards used to determine the NMHC + NOx standard.  (Highlighted in blue)

For more information or assistance, call the APCD at (805) 961-8800 or e-mail us at [email protected].

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