Air Quality Assessments

Our air quality team specializes in the preparation of air quality and greenhouse gas assessments for a variety of projects, including mixed-use infill developments, transportation improvements (see below), and school expansions. 

We use air quality tools (CalEEMod and EMFAC) to estimate mass emissions of criteria air pollutants and dispersion models (CALINE, and AERMOD) to estimate concentrations of toxic air contaminants. Based on our modeling results, we can analyze potential health risks to nearby sensitive receptors exposed to air pollution. We can also identify control measures to effectively reduce potential air quality impacts below threshold levels established be federal, state, and/or local agencies.  

We closely follow the ever-changing regulatory scene of greenhouse gas emissions and provide comprehensive analyses to determine a project’s emissions and its consistency with regulations and planning goals. We also specialize in the preparation of project-level greenhouse gases inventories and reduction plans for large-scale projects.

Our staff keeps up-to-date on the most recent regulations and guidance documents, and communicates with representatives from the local air district to ensure our sections are always technically accurate and legally defensible. We also like to share our experiences and recommendations by publishing articles in the AEP Environmental Monitor. Our most recent article regarding construction emissions from small-lot infill developments can be found here. 

Transportation Conformity Analyses


Baseline’s air quality services for transportation projects include Air Quality Conformity assessments to analyze carbon monoxide and particulate matter (both PM10 and PM2.5) hot-spots; short-term construction emissions of criteria air pollutants; long-term operational emissions of mobile source air toxics; and greenhouse gas emissions. By working closely with Caltrans and local transportation authorities, Baseline has developed a unique knowledge related to large highway/roadway improvement projects and can perform air quality assessments in a timely and cost-effective manner.