Speciation Profiles Used in CARB Modeling
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Speciation profiles provide estimates of the chemical composition of emissions, and are used in the emission inventory and air quality models. CARB maintains and updates estimates of the chemical composition and size fractions of particulate matter (PM) and the chemical composition and reactive fractions of total organic gases (TOG), for a variety of emission source categories.
Speciation Profiles
CARB's current PM and Organic Gas Speciation Profiles are available for download from this page as Excel spreadsheet files (PMPROF and ORGPROF). Each speciation profile provides weight fraction data of each chemical species making up the total particulate matter or total organic gases, and is designated by an identification code number. The chemical species are identified by a 5-digit SAROAD code and the chemical name. For PM, there are also PM size fraction tables, which provide the particulate mass within each size fraction (PM total, PM 10, or PM 2.5) for individual source categories. The PMSIZE spreadsheet file contains a summary of the PM size fractions for each PM profile. To compute the amount of a specific chemical constituent in the PM size fraction of interest, each PM chemical weight fraction must be multiplied by the appropriate PM size fraction.
Download Option
CHEM- Chemical species data for source categories
FRAC - Fraction data for source categories
ORGPROF - Organic chemical profiles for source categories
PMPROF - Particulate matter chemical profiles for source categories
PMSIZE - Particle size fraction data for source categories
ORGPROF_REF - Reference number for organic gas profiles (link to the references)
PMPROF_REF - Reference number for PM profiles (link to the references)