1  Mobile combustion

1.1 Introduction

Transportation emissions, when grouped together, are one of the largest sources of greenhouse gas emissions nationally, statewide, and locally.

This is the transportation section for estimating on-road emissions. Modes included are motorcycles, passenger cars, intercity buses, light commercial trucks, single unit long-haul trucks, refuse trucks and transit buses. Aviation data provided are considered preliminary at this time.

Note that this does not include freight rail, light rail, and other transportation emissions.

1.2 2022 emissions

Transportation emissions totaled 16.41 MMtCO₂e, accounting for 33% of regional emissions in 2022.

We can also view this data broken out by fuel type.

Figure 1.1: 2022 annual emissions transportation by fuel type

1.3 Historical emissions

Despite a 10.3% reduction in the transportation sector due to the Covid pandemic, emissions in this sector rebounded to in 2022.

Figure 1.2: Transportation emissions, 2002-2022