Special Feature: KORUS-AQ
The Korea-United States Air Quality (KORUS-AQ) field study was conducted in May-June 2016 under the joint sponsorship of the National Institute of Environmental Research (NIER) of South Korea and the National Aeronautics and Space Administration (NASA) of the United States. KORUS-AQ employed a multi-perspective observing strategy including aircraft, ground sites, satellites, and models to understand the factors controlling air quality over the Seoul Metropolitan Area and across the Korean peninsula and surrounding waters. The project also provided a testbed for future remote sensing of air quality from geostationary orbit by satellite launches planned by both nations. This Special Feature provides an overview of the study’s experimental design and meteorological setting as well as high level science findings on the factors controlling air quality in terms of both ozone and fine particle pollution and the relative contributions of local versus transboundary emissions.