The chart shows nine pairs of rows. Each pair of rows includes the 2020 and 2050 NOx Truck Trip Emissions against those from all vehicles for the OKI region as a whole and for each of the eight OKI member counties. NOx truck trip emission values range from 54.5% (Clermont County's 2020 value) to 88.9% (Dearborn County's 2050 value) of all vehicle emissions.