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Emissions Inventory
 

 

 

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AMI has extensive experience in developing  emissions of  criteria pollutants (NOx, SOx, VOC, PM), air toxics and other hazardous materials. We have developed emissions for single facilities as well as industrywide classes and regional inventories. These emissions are suitable for input to Gaussian plume models such as ISCST3 and AERMOD for inert pollutants, photochemical grid models such as CAMx, CMAQ and UAM for ozone and PM2.5, and multipathway risk assessment models such as AMI's   Assessment of Chemical Exposure (ACE) models, including  ACE2588ACEHWCF and ACEME. Representative projects performed by AMI include the following:
 

NSR/PSD Permit Application for A Sulfur Plant

AMI performed an emissions analysis and air modeling study in support of the permit application for the General Chem sulfur plant located in Richmond, CA. AMI participated in the development of project-specific emissions including facility visits to verify facility operation, stack parameters and nearby building dimensions. AMI employed the ISCST3 model to analyze potential air quality impacts with 5 years of meteorological data according to the Bay Area AQMD NSR guidelines. AMI also performed a screening visibility impact analysis of project emissions (NOx, SO2 and PM10) at two closest PSD Class I areas.

Development of  Microscale Air Toxics Emission Inventory

For the on-going MATES III study by the South Coast AQMD, AMI is currently responsible for developing air toxics emission inventories for over 300 facilities at three sites located along the Alameda Corridor in Los Angeles. At each site, facilities emitting air toxics within a 0.5 mile radius will be identified and inventoried. Facility data are compiled from various databases, including AB2588 air toxics inventory reports (ATIR) and the SCAQMD annual emissions reporting (AER) program. Facilities will also be identified through online searches of business mailing lists and onsite visits through the neighborhoods. Facilities will be contacted and surveyed to obtain information on their recent facility operations. The latest air toxics emission factors and emission estimation techniques will also employed in the emission calculations. Following comprehensive QA/QC checks, AMI will generate both baseline and projected emissions that are suitable for hot spot modeling by the ISCST3 and AERMOD  models.

Industrywide Air Toxics Emission Inventory Development

In a contract with the South Coast AQMD, AMI was responsible for developing emission inventories for facilities emitting less than 10 tons per year in the South Coast Air Basin. Industrywide emission inventories were developed for five categories: gasoline stations, printing shops, hospitals/sterilizers, autobody/paint shops and metal plating shops. Comprehensive mail surveys were used to collect facility data and updated emission factors were employed in the emission calculation. Following the development of the inventories, AMI  employed them in  industrywide health risk assessments.
 

Development of A Regional Air Toxics Point Source Emission Inventory

For the recent MATES II study by the South Coast AQMD, AMI was responsible for developing air toxics emission inventories for over 10,000 point sources in the South Coast Air Basin. Facility data were compiled from various databases, including AB2588 air toxics inventory reports (ATIR) and industrywide categories. Emissions from major point sources have been updated to reflect more recent facility operations. Air toxics emission factors derived from source testing were also employed in the emission calculations. Updated speciation profiles were used to derive air toxics emissions from facility VOC and PM emissions. Following comprehensive QA/QC checks, AMI generated both baseline and projected emissions that are suitable for regional exposure modeling by the Urban Airshed Model (UAM).

Gridded Emission Inventory for Phoenix Ozone Modeling  

In a contract with the Arizona DEQ, AMI was responsible for generating the gridded emission inventories for ozone precursors (NOx and VOC) in the Phoenix non-attainment area. NOx emissions were speciated into NO and NO2, and VOC emissions into various classes required by the Carbon Bond IV photochemical mechanism. AMI used various programs in the Emissions Preprocessing System (EPS) to process all source categories including point sources, mobile sources, area sources and biogenics. AMI also updated biogenic emissions using updated emission factors and land use data in Maricopa County. AMI developed gridded emission inputs suitable for UAM modeling for  the baseline year, and applied emission control measures to generate emissions for future years.  
 



 

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