CALIFORNIA AIR RESOURCES BOARD

APCD/AQMD RULE EVALUATION FORM -- Page 1

(Electronic Format) 

I. GENERAL INFORMATION

District: South Coast Air Quality Management District

Rule No(s): 2449 Date adopted/Amended/Rescinded: May 2, 2008

Rule Title(s): Control Of Oxides of Nitrogen Emissions from Off-Road Diesel Vehicles

Date Submitted to ARB: May 9, 2008

If an Amended Rule, Date Last Amended (or Adopted): 

Is the Rule Intended to be Sent to the U.S. EPA as a SIP Revision? Yes No (If No, do not complete remainder of form)

District Contact: Henry Hogo Phone Number: (909) 396-3184 E-mail Address: hhogo@aqmd.gov

Narrative Summary of New Rule or Rule Changes: New Rule Amended Rule 

Rule 2449, Control Of Oxides of Nitrogen Emissions from Off-Road Diesel Vehicles. Rule 2449 adopts by

reference and implements the Surplus Off-Road Opt-In for NOx (SOON) provision of the CARB’s “In-Use OffRoad Diesel Vehicle” Regulation under Title 13 of the California Code of Regulations, Section 2449.3. The 

SCAQMD Governing Board formally opted-in to the State SOON Program on May 2, 2008. Rule 2449 will achieve 

surplus NOx reductions beyond those required under CARB’s In-Use Off-Road Diesel Vehicle Regulation, adopted 

in July 2007, through incentive funding provided by AQMD. The rule applies to fleets with more than 20,000 hp in 

maximum power on a statewide basis with more than 40% Tier 0 and 1 equipment as of January 1, 2008. Fleet 

operators subject to this regulation are required to meet the more striingent SOON NOx targets or apply for 

incentive funding for suffiecient number of projects (e.g., repowers, purchases, replacements) to meet these 

targets. Fleet operators are required to submit a complinace plan along with their funding applications to 

demonstrate that equipment identified for SOON funding will result in surplus reductions in order to qualify for 

incentive funding. Once a fleet operator receives funding for a qualified project, the fleet operator is required to 

implement the project.

Pollutant(s) Regulated by the Rule (Check): ROG (NOx) SO2 

 (CO) PM TAC (name): 

II. EFFECT ON EMISSIONS

Complete this section ONLY for rules that, when implemented, will result in quantifiable changes in emissions. Attach reference(s) for emission 

factor(s) and other information. Attach calculation sheet showing how the emission information provided below was determined. 

Net Effect on Emissions: Increase Decrease N/A 

Emission Reduction Commitment in SIP for this Source Category: 12 tons per day NOx, 1 ton per day of ROG, and 0.5 

ton per day of PM2.5 by 2014

Inventory Year Used to Calculate Changes in Emissions: 2014 Area Affected: SCAQMD

Future Year Control Profile Estimate (Provide information on as many years as possible): 

An estimated 100 to 150 fleets (or 1,000 to 1,300 off-road diesel equipment) are affected by Rule 2449 based on an 

anticipated $120 million level of funding over the next four years. The overall perecent reductions are approximately 

14.5% for NOx, 10.5% for ROG and 21.7% for PM2.5 in 2014. 
CALIFORNIA AIR RESOURCES BOARD 

APCD/AQMD RULE EVALUATION FORM -- Page 2

(Electronic Format) 

Baseline Inventory in the SIP for the Control Measure: 2002 Baseline Inventory: 158.9 tons per day of NOx, 23.5 tons per 

day of ROG, and 9 tons per day of PM2.5; 2014 Baseline Inventory: 82.7 tons per day of NOx, 9.5 tons per day of ROG, 

and 2.3 tons per day of PM2.5 (i.e., remaining emissions after implementation of the State In-Use Off-Road Diesel Vehicle 

Regulation).

Emissions Reduction Commitment in the SIP for the Control Measure: 12 tons per day of NOx, 1 ton per day of ROG, and 

0.5 ton per day of PM2.5.

Revised Baseline Inventory (if any): 

Revised Emission Reduction Estimate (if developed): 

Note that the district’s input to the Rule Evaluation Form will not be used as input to the ARB’s emission forecasting and 

planning. 

III. SOURCES/ATTAINMENT STATUS

District is: Attainment Nonattainment Split 

Approximate Total Number of Small (<100 TPY) Sources Affected by this Amendment: 

Percent in Nonattainment Area: % 

Number of Large (> 100 TPY) Sources Controlled: Percent in Nonattainment Area: % 

Name(s) and Location(s) (city and county) of Large (> 100 TPY) Sources Controlled by Rule (Attach additional sheets as 

necessary): 

IV. EMISSION REDUCTION TECHNOLOGY

Does the Rule Include Emission Limits that are Continuous? Yes No 

If Yes, Those Limits are in Section(s) of the Rule. 

Other Methods in the Rule for Achieving Emission Reductions are: 

V. OTHER REQUIREMENTS

The Rule Contains: 

Emission Limits in Section(s): 2449.3 (d)(1)(C) Work Practice Standards in Section(s): 

Recordkeeping Requirements in Section(s): Reporting Requirements in Section(s): 2449.3 (d)(1)(A) and (e)(3)
CALIFORNIA AIR RESOURCES BOARD 

APCD/AQMD RULE EVALUATION FORM -- Page 3

(Electronic Format) 

5/1/2002

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VI. IMPACT ON AIR QUALITY PLAN

 No Impact Impacts RFP Impacts attainment 

Discussion: Rule 2449 is expected to result in substantial emissions reductions which are critical for achieving the state 

and federal RFP requirements, attainmemnt of the federal annual ambient air quality standard for PM2.5 by 2014,.and 

making progress toward attainment of the 8-hour ozone standard by 2023.