These actions included implementing heightened vehicular emissions standards, restricting use of vehicles by license plate number, relocating and closing industrial facilities in Beijing and the surrounding province, and stopping construction activities (Zhang et al. 2013).
Other studies have shown that NOx emissions from heavy-duty diesel vehicles are three times higher at low speeds than when at highway speed [ 34], and PM, elemental carbon (EC) and organic carbon (OC), and air toxics emissions are heightened during start-and-stop traffic [ 35, 36], but these insights are not captured in our emissions model.
When it comes to the possible impact of RF EMF exposure, there exist special concerns and considerations for children, whose brains and nervous systems are still developing, and therefore may have heightened sensitivity to these emissions.
The July eruptive episode was preceded by several days of measurable expansion of the summit area, heightened earthquake activity, and changed emission rates of sulfur dioxide and carbon dioxide.
Meanwhile, states such as California and New Jersey have heightened targets to cut greenhouse gas emissions while ramping up solar and wind energy capacity.
While atmospheric dispersion models linked with local-scale emissions characterization can also be used to determine relative source contributions, both emissions and dispersion models may have heightened uncertainties at high spatial resolution, and it is valuable to determine insights available through ambient monitoring.
Even as it is cheered by transit officials, the new popularity of buses has alarmed environmentalists, who say the heightened congestion created by more buses means more emissions.
Increased supplies of oil from non-Middle East countries, such as Angola, coupled with the advent of alternative green-energy systems, improved conservation, and heightened awareness about the need to curb carbon emissions, are also reducing Saudi leverage.
During that period, scientific concern over global warming heightened, but the federal government did absolutely nothing to mandate greenhouse gas emissions reductions.
It was later in that decade when the company turned a deaf ear to what its scientists were saying, presumably because it feared heightened awareness about climate change could lead to government controls on carbon emissions.
