Transcript State of the Air Quality Practice

Diesel Emissions Regulation and Control
Impact of ARB Regulation
Diesel Particulate Matter Composition
 Highly variable chemical mixture
 Dependent on engine, fuel and combustion
parameters
 Balance of organic and inorganic carbon to
sulfates is a function of sulfur fraction in fuel
 Measured as all PM emitted from diesel
engine
 Difficult to measures in ambient air -surrogates typically used
- Elemental carbon
- Organic carbon
- Black carbon
California Inventory of Diesel Emissions (2000)
Stationary prime
Emergency/Standby
On-road
Off-road
Portable
Sources of Diesel Emissions
 On road mobile sources
- Cars
- Trucks
 Off-road mobile sources
- Heavy equipment
- Trains
- Marine Vessels
 Stationary sources
- Emergency generators
- Other diesel-fueled equipment
ARB Diesel Risk Reduction Program
 On-road mobile sources
-
Lower emissions standards for HDV engines
Retrofit existing engines
Solid waste vehicle standards
Other vehicle fleet standards
 Off-road mobile sources
-
Lower emissions standards
Retrofit of existing engines
Auxiliary engine fuel standards
Harbor craft standards
Other marine vessel measures in progress
Required PM Emissions Reductions for Off-road
Engines
0.45
0.35
0.3
175<hp<300
0.25
300<hp<600
0.2
600<hp<750
0.15
>750 hp
0.1
0.05
20
14
20
12
20
10
20
08
20
06
20
04
20
02
0
20
00
Emissions (g-bhp-hr)
0.4
On-Road PM Reduction Measures
Typical Diesel PM Reduction Measures
 Lower Sulfur in fuel
- Mostly reduces sulfate portion of PM
 Add-on PM filter
 Replace diesel fuel
- With natural gas for some vehicles
- With electrical power for other uses
 Improve engine design to reduce PM
emissions
- Require newer models for use