Future year air quality Sample Clauses

Future year air quality. Projected PM2.5 and O3 distributions are shown in Figures 5-a and 5-b. Projected ambient air pollution in the year 2050 was derived using four different future emission scenarios. Among all the four emission scenarios, simulated pollutant concentrations using the MTFR scenario (WRF-Chem-MTFR) were the lowest both for PM2.5 (a mean of 13 ± 17 μg/m3 in January) and for O3 (a mean of 48 ± 10 ppb in July). The low concentrations reflect the reduction in emissions, which led to the decreased PM2.5 and O3 concentrations. The result may be compared to the finding of the Slentø et al. (2009) study. They discussed GAINS emissions in 2020 over Denmark under MTFR scenario, and found that technology adds-ons led to a ~50% emission reductions for NOx and SO2, and a 70% reduction for PM2.5 emissions compared to their baseline scenario, which assumes maintaining current legislation. They did not discuss the effects on the air pollutants, but it is clear that as a consequence of emissions reduction, PM2.5 would be lower compared to the baseline scenario. WRF-Chem-MTFR estimated an over 80% higher PM2.5 concentration in January in East China compared with North China, which was still 40% lower than model-simulated result from Air (WRF-Chem-Air). WRF-Chem-MTFR also estimated 10-16% higher O3 concentrations in East and North China compared to the Southwest in July.