3-1

 

Classification of Nonattainment Areas for O3 and CO Mandated in the CAA Amendments of 1990,

 

92

3-2

 

Federal, State, and Local VOC Emission-Reduction Measures in Four Illustrative SIPs,

 

118

3-3

 

Federal, Multistate, State, and Local NOx Emission-Reduction Measures in Four Illustrative SIPs,

 

119

3-4

 

Classifications and Number of Nonattainment Areas in 1992 Remaining in Nonattainment As of February 6, 2003,

 

127

4-1

 

Types of Vehicles and Engines Regulated by AQM in the United States,

 

134

4-2

 

Contribution of Nonroad Emissions to Mobile-Source Total and to Manmade Total,

 

143

4-3A

 

Average PM2.5 Emissions by Vehicle Model Years for Medium- and Heavy-Duty Trucks,

 

152

4-3B

 

Average NOx Emissions by Vehicle Model Years for Medium- and Heavy-Duty Trucks,

 

153

4-4

 

Timeline of Significant Federal and State Regulations for Motor Vehicle Fuels,

 

156

4-5

 

Part 1: California and Federal Reformulated Gasoline Programs,

 

158

 

 

Part 2: Future Reformulated Gasoline Program,

 

159

5-1

 

Allowable Concentration Increments (micrograms per cubic meter) for Prevention of Significant Deterioration (PSD),

 

182

5-2

 

NOx Emissions from Coal-Fired Boilers in 1999 by Vintage,

 

184

5-3

 

Open-Market and Other Noncapped Forms of Trading,

 

211

6-1

 

Summary of EPA’s Trends in Estimated Nationwide Pollutant Emissions and Average Measured Concentrations,

 

218

6-2

 

Summary of Major U.S. Monitoring Networks,

 

222

6-3

 

Locations of Initial PM2.5 Supersites,

 

228

6-4

 

Ozone Monitoring Sites in the United States,

 

234



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