Extended Data Fig. 4: Schematic of the methodology.
From: Criteria pollutant impacts of volatile chemical products informed by near-field modelling
This work integrated near-field (that is, SHEDS-HT) with far-field (that is, CMAQ modeling with 2011 NEI) modeling and top-down constraints based on ambient measurements. The blue boxes indicate emission estimates that were inter-compared. The emissions in EPA 2011 NEI, containing the estimate for VCP-emitted VOCs (solid outlined), went into air quality modeling. The yellow boxes indicate processing of the NEI including chemical speciation of emissions with the SPECIATE database, and mapping to CMAQ regional model surrogates using a certain chemical mechanism (for example, SAPRC07). For VCPs, SOA formation was parametrized with a fixed SOA yield (large dashed arrow), and thus emission processing was not required for VCP-emitted VOCs. See more details in Methods.
