Yet cleaning up truck pollution presents complex problems for China's leaders.
Gavin Shaddick, who led the international team that put together the data, said: "Globally, air pollution presents a major risk to public health and a substantial number of lives could be saved if levels of air pollution were reduced".
As you turn onto the western border, the source of that pollution presents itself: mile after mile of sugarcane fields, with runoff flowing through drainage canals directly into the refuge.
Light pollution presents a real problem; the Orion Nebula, and the brightest open and globular clusters, together with the moon, were easy targets, but galaxies and dimmer clusters lack detail.
Series such as those documenting the 1991 Oakland Hills fire, military bombing ranges, and industrial pollution present uneasy views of destruction that are simultaneously beautiful and beastly.
The assumption that human fecal pollution presents the greatest health risk needs further evaluation.
Dogs exposed to Mexico City air pollution presented evidence of chronic inflammation, neurodegeneration, and DNA damage in various brain regions [ 28, 66].
They found that the strongest effect of air pollution presented a time lag with regard to air pollution concentrations, while there was also a suggestion for a cumulative effect.
Indoor air pollution presents yet another major health threat, with 32% of deaths in South Asia attributable to the burning of solid fuels in poor, small, unventilated houses (Smith 2000; WHO 2004).
