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It could be something as simple as a run away script or learning how to better use E-utilities, for more efficient work such that your work does not impact the ability of other researchers to also use our site.To restore access and understand how to better interact with our site to avoid this in the future, please have your system administrator contact [email protected] formation mechanisms leading to severe haze episodes with exceedingly high PM in Beijing has been suggested to be mainly from industrial pollution and secondary inorganic aerosol formation, but negligibly from traffic emissions (14).In addition, meteorological conditions may govern regional and long-range transport of air pollutants (17, 18).For example, the noticeably decreasing mass concentrations during the morning hours on 26, 27, and 28 September coincide with wind speed increasing by 1.8, 0.5, and 1.8 m⋅s); the timing and size of the elevated aerosols are indicative of primary particle emissions originating from local transportation (24, 25).Although primary emissions by local traffic are clearly discernible by the transiently elevated number concentrations and may play a role in maintaining the particle number concentrations during the polluted period, these primary particles do not appreciably alter the particle mass growth.
"; "Clear up the question of who is at fault"elaborate, expatiate, expound, lucubrate, dilate, flesh out, exposit, enlarge, expand - add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing; "She elaborated on the main ideas in her dissertation"When I have intimated that the foreigner with the scar was a member of the Brotherhood (admitted in Italy after Pesca's departure from his native country), and when I have further added that the two cuts, in the form of a T, on the left arm of the dead man, signified the Italian word "Traditore," and showed that justice had been done by the Brotherhood on a traitor, I have contributed all that I know towards At the back of the estrade, and attached to a moveable partition dividing this schoolroom from another beyond, was a large tableau of wood painted black and varnished; a thick crayon of white chalk lay on my desk for the convenience of any grammatical or verbal obscurity which might occur in my lessons by writing it upon the tableau; a wet sponge appeared beside the chalk, to enable me to efface the marks when they had served the purpose intended.
While the particle chemical compositions in Beijing are similar to those commonly measured worldwide, efficient nucleation and growth over an extended period in Beijing are distinctive from the aerosol formation typically observed in other global areas.
Gaseous emissions of volatile organic compounds and nitrogen oxides from urban transportation and sulfur dioxide from regional industry are responsible for large secondary PM formation, while primary emissions and regional transport of PM are insignificant.
Accumulation of the particle mass concentration exceeding several hundred micrograms per cubic meter is accompanied by a continuous size growth from the nucleation-mode particles over multiple days to yield numerous larger particles, distinctive from the aerosol formation typically observed in other regions worldwide.
The particle compositions in Beijing, on the other hand, exhibit a similarity to those commonly measured in many global areas, consistent with the chemical constituents dominated by secondary aerosol formation.
Our results highlight that regulatory controls of gaseous emissions for volatile organic compounds and nitrogen oxides from local transportation and sulfur dioxide from regional industrial sources represent the key steps to reduce the urban PM level in China.–5).