Particulate pollution trends in the United States
估计颗粒物生产函数，研究颗粒物如何随制造业活动变化，并考察更严格环境规制的县是否单位经济活动污染更少，以及规制是否将经济增长转移到规制较弱的地区。
Particulates are one indicator of air quality. This paper estimates particulate production functions to study how particulates co-move with manufacturing activity. I study whether more regulated counties enjoy less pollution per unit of economic activity and whether particulate regulation displaces economic growth to less regulated areas.