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Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Proc+Natl+Acad+Sci+U+S+A 2018 ; 115 (20): 5099-104 Nephropedia Template TP
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Unexpected slowdown of US pollutant emission reduction in the past decade #MMPMID29712822
Jiang Z; McDonald BC; Worden H; Worden JR; Miyazaki K; Qu Z; Henze DK; Jones DBA; Arellano AF; Fischer EV; Zhu L; Boersma KF
Proc Natl Acad Sci U S A 2018[May]; 115 (20): 5099-104 PMID29712822show ga
Emissions of nitrogen oxides (NOx) have a large impact on air quality and climate change as precursors in the formation of ozone and secondary aerosols. We find that NOx emissions have not been decreasing as expected in recent years (2011?2015) when comparing top-down estimates from satellites and surface NO2 measurements to the trends predicted from the US Environmental Protection Agency?s emission inventory data. The discrepancy can be explained by the growing relative contribution of industrial, area, and off-road mobile sources of emissions, decreasing relative contribution of on-road gasoline vehicles, and slower than expected decreases in on-road diesel NOx emissions, with implications for air-quality management.