Highway improvement projects have the potential to affect air quality by changing traffic volumes and/or vehicle operating characteristics at specific locations. The air quality impacts of highway construction projects range from intensifying existing air pollution problems to improving local air quality.
Mobile Source Air Toxic (MSAT) emissions are expected to improve compared to existing conditions after the project is built. The project is also expected to help reduce greenhouse gas (GHG) emissions by reducing stop-and-go conditions, improving speeds and traffic flow, and providing improved bicycle and pedestrian connectivity. Potential short-term, localized air quality impacts could be experienced related to dust and equipment emissions during construction.
For More Information
To read more about the study approach, existing conditions, and effects on air quality, please see Section 3.4 of the Supplemental Environmental Assessment.