Constraints on NOx-dependent O3 production and VOC Reactivity over New York City from measurements of NO2 columns and surface O3

UV/Visible spectrometers are capable of making high-precision measurements of the NO2 column and future measurements of the NO2 column will provide neighborhood-scale hourly information. We use current measurements of the NO2 column at 1:30 PM local solar time from the Ozone Monitoring Instrument (OMI) and in situ measurements of surface O3 from the EPA AQS monitoring system for select summertime days (June, July, August) from 2005 to 2014 to estimate the NOx-dependence of O3 production over and downwind of the New York City metropolitan area. From this estimate, we provide constraints on the reactivity-weighted VOC concentration necessary to achieve the observed pattern of O3 production. Our findings suggest that future hourly NO2-column measurements will provide valuable near-real time information on the production of O3 upwind of communities in the wake of NOx emission outflow.