美国环保局估计在1990到2015年间，全国颗粒物浓度下降了37 % ， 并且在2010年，由于上述规则实施而避免了约160,000人过早死亡。
The EPA estimates that between 1990 and 2015, the national concentration of particulate matter fell by 37%, and that in 2010, some 160,000 premature deaths were averted as a result of the regulations.