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Reductions in haze across the United States since the early 1990s

机译：自1990年代初以来，整个美国的雾霾减少

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The widespread decrease in the haziest conditions and the dramatic improvement in scenic clarity, especially in the eastern United States, points to the success of the combined regulatory activity that has resulted in reduced SO_2 and NO_x emissions and therefore secondary aerosol concentrations. However, because conditions in the West were initially cleaner and thus closer to natural background levels (～20 Mm~(-1) in the West and ～30 Mm~(-1) in the East for the haziest conditions), improvements in the haziest bext have not been as significant; in fact, at some sites the haziest conditions have actually increased. As emissions from regulated sources continue to decline, the relative contributions to visibility degradation from other sources such as wildfire emissions, dust, unregulated sources, or international contributions are likely to increase. The role of these sources requires more research to fully understand and predict in the context of regional haze goals.
机译：最朦胧的条件的普遍减少和风景清晰度的显着提高（尤其是在美国东部），表明联合监管活动取得了成功，这导致减少了SO_2和NO_x的排放，从而降低了次级气溶胶的浓度。但是，由于西部地区的条件最初更清洁，因此更接近自​​然本底水平（西部地区最朦胧的条件为〜20 Mm〜（-1），东部地区为〜30 Mm〜（-1）），因此改善了最模糊的be​​xt没有那么重要;实际上，在某些地点，最模糊的条件实际上已经增加了。随着受管制来源的排放量继续减少，野火排放，粉尘，不受管制来源或国际贡献等其他来源对能见度下降的相对贡献可能会增加。这些资源的作用需要进行更多的研究，才能在区域霾害目标的背景下充分理解和预测。

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