Mobile Source Mitigation Opportunities

2011 ◽  
pp. 191-224
Author(s):  
Michael P. Walsh
Keyword(s):  
Mobile Source

Spatial Allocation Effects of Forecast Land Uses on Statewide Mobile Source Emissions

2009 ◽  
Author(s):  
Michael DuRoss ◽  
Reza Taromi ◽  
Ardeshir Faghri ◽  
Scott Thompson-Graves
Keyword(s):  
Land Uses ◽  
Mobile Source ◽  
Spatial Allocation ◽  
Mobile Source Emissions

scholarly journals Mobile Source Air Toxic Emissions

2016 ◽  
Vol 66 (2) ◽  
pp. 97-97
Author(s):  
Susan Collet
Keyword(s):  
Mobile Source ◽  
Toxic Emissions

Mobile Source Air Toxics (MSATs) from High Efficiency Clean Combustion: Catalytic Exhaust Treatment Effects

2008 ◽  
Vol 1 (1) ◽  
pp. 1157-1166 ◽  
Author(s):  
John M. E. Storey ◽  
Samuel A. Lewis ◽  
James E. Parks ◽  
James P. Szybist ◽  
Teresa L. Barone ◽  
...  
Keyword(s):  
Treatment Effects ◽  
High Efficiency ◽  
Air Toxics ◽  
Mobile Source ◽  
Exhaust Treatment ◽  
Clean Combustion

Ionospheric heater beam scanning: A mobile source of ELF radiation

Radio Science ◽  
1987 ◽  
Vol 22 (6) ◽  
pp. 1073-1083 ◽  
Author(s):  
R. Barr ◽  
M. T. Rietveld ◽  
P. Stubbe ◽  
H. Kopka
Keyword(s):  
Mobile Source ◽  
Beam Scanning

scholarly journals Investigation of the Effect of Mid- And High-Level Ethanol Blends on the Particulate and the Mobile Source Air Toxic Emissions from a Gasoline Direct Injection Flex Fuel Vehicle

2018 ◽  
Vol 33 (1) ◽  
pp. 429-440 ◽  
Author(s):  
Jiacheng Yang ◽  
Patrick Roth ◽  
Thomas D. Durbin ◽  
Kent C. Johnson ◽  
Akua Asa-Awuku ◽  
...  
Keyword(s):  
Direct Injection ◽  
Gasoline Direct Injection ◽  
Mobile Source ◽  
Toxic Emissions ◽  
Flex Fuel ◽  
Ethanol Blends ◽  
High Level

Modeling Mobile Source Air Pollution Inventories

2000 ◽  
pp. 142-157 ◽  
Author(s):  
Michael L. Deaton ◽  
James J. Winebrake
Keyword(s):  
Air Pollution ◽  
Mobile Source

scholarly journals Simulation of Air Pollution from Mobile Source Emissions in the City of Rio de Janeiro

1999 ◽  
Vol 10 (3) ◽  
pp. 203-208 ◽  
Author(s):  
I.C.B. Campos ◽  
A.S. Pimentel ◽  
S.M. Corrêa ◽  
G. Arbilla
Keyword(s):  
Air Pollution ◽  
Rio De Janeiro ◽  
Mobile Source ◽  
Mobile Source Emissions ◽  
The City

scholarly journals Characteristics of PM<sub>2.5</sub> speciation in representative megacities and across China

2011 ◽  
Vol 11 (1) ◽  
pp. 1025-1051 ◽  
Author(s):  
F. Yang ◽  
J. Tan ◽  
Q. Zhao ◽  
Z. Du ◽  
K. He ◽  
...  
Keyword(s):  
Los Angeles ◽  
Atmospheric Pollution ◽  
Urban Areas ◽  
Fine Particles ◽  
Chemical Species ◽  
Northern Region ◽  
Eastern Region ◽  
Mobile Source ◽  
Combustion Source ◽  
Geographical Regions

Abstract. Based on PM2.5 chemical database from literature and our observations, chemical species and reconstructed speciation of PM2.5 in several representative Chinese megacities and across China were compared to draw insights into the characteristics of PM2.5 speciation. PM2.5 mass and speciation varied substantially over geographical regions in China. Near six-fold variations in average PM2.5 concentrations (34.0–193.4 μg m−3) across China were found with high PM2.5 levels (>100 μg m−3) appearing along northern region and in western urban areas. At both urban and rural sites in eastern region, sum of sulfate, nitrate, and ammonia (SNA) typically constituted 40–57% of PM2.5 mass, indicative of the regional characteristics of fine particulate pollution and more intensive "complex atmospheric pollution" compared to western region. Particulate organic matter (POM) had constant and significant contribution to PM2.5 mass. POM plus SNA accounted for 62–90% of PM2.5 mass at most of the sites. PM2.5 speciation in China was also characterized by high content of mineral dust. In four representative megacities (i.e. Beijing, Chongqing, Shanghai, and Guangzhou) with substantially higher levels of all the species except that NO3−, NH4+, and EC in PM2.5 than those in Los Angeles, distinct differences in nitrate and sulfate levels and their mass ratio [NO3−]/[SO42−] imply that mobile source is likely more important than stationary (coal combustion) source in Guangzhou whereas in Chongqing the situation is contrary. The observed intra-city variations in PM2.5 mass and speciation indicate that local emissions and regional transportation both contributed significantly to high fine particles levels in Beijing, while local contribution likely played a predominant role in Chongqing. During the ten-year period from 1999 through 2008 in urban Beijing, both SNA and [NO3−]/[SO42−] exhibited steadily increasing trends, implying that the characteristic of "complex atmospheric pollution" and the contribution from mobile sources were both being enhanced.

scholarly journals Modeled and observed ozone sensitivity to mobile-source emissions in Mexico City

2009 ◽  
Vol 9 (1) ◽  
pp. 39-55 ◽  
Author(s):  
M. Zavala ◽  
W. Lei ◽  
M. J. Molina ◽  
L. T. Molina
Keyword(s):  
Mexico City ◽  
Emission Control ◽  
Emission Factors ◽  
Nox Emission ◽  
Base Case ◽  
Mobile Source ◽  
Historical Trends ◽  
Emission Reductions ◽  
Control Policies ◽  
The Past

Abstract. The emission characteristics of mobile sources in the Mexico City Metropolitan Area (MCMA) have changed significantly over the past few decades in response to emission control policies, advancements in vehicle technologies and improvements in fuel quality, among others. Along with these changes, concurrent non-linear changes in photochemical levels and criteria pollutants have been observed, providing a unique opportunity to understand the effects of perturbations of mobile emission levels on the photochemistry in the region using observational and modeling approaches. The observed historical trends of ozone (O3), carbon monoxide (CO) and nitrogen oxides (NOx) suggest that ozone production in the MCMA has changed from a low to a high VOC-sensitive regime over a period of 20 years. Comparison of the historical emission trends of CO, NOx and hydrocarbons derived from mobile-source emission studies in the MCMA from 1991 to 2006 with the trends of the concentrations of CO, NOx, and the CO/NOx ratio during peak traffic hours also indicates that fuel-based fleet average emission factors have significantly decreased for CO and VOCs during this period whereas NOx emission factors do not show any strong trend, effectively reducing the ambient VOC/NOx ratio. This study presents the results of model analyses on the sensitivity of the observed ozone levels to the estimated historical changes in its precursors. The model sensitivity analyses used a well-validated base case simulation of a high pollution episode in the MCMA with the mathematical Decoupled Direct Method (DDM) and the standard Brute Force Method (BFM) in the 3-D CAMx chemical transport model. The model reproduces adequately the observed historical trends and current photochemical levels. Comparison of the BFM and the DDM sensitivity techniques indicates that the model yields ozone values that increase linearly with NOx emission reductions and decrease linearly with VOC emission reductions only up to 30% from the base case. We further performed emissions perturbations from the gasoline fleet, diesel fleet, all mobile (gasoline plus diesel) and all emission sources (anthropogenic plus biogenic). The results suggest that although large ozone reductions obtained in the past were from changes in emissions from gasoline vehicles, currently significant benefits could be achieved with additional emission control policies directed to regulation of VOC emissions from diesel and area sources that are high emitters of alkenes, aromatics and aldehydes.

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