On the short‐term impact of pollution: The effect of PM 2.5 on emergency room visits
利用风速作为工具变量，研究PM2.5暴露对智利各年龄段人群呼吸系统急诊就诊的短期影响，发现每增加1微克/立方米，急诊就诊增加0.36%。
Abstract In this paper, we study the short‐term effect of fine particulate matter (PM 2.5) exposure on respiratory emergency room (ER) visits in Chile, a middle‐income country with high levels of air pollution. To instrument for PM 2.5, we use wind speed at different altitudes (pressure levels). Unlike previous papers, our data allow us to study the impact of high pollution levels across all age groups. We find that a 1 μg per cubic meter (μg/m 3 ) increase in PM 2.5 exposure for 1 day increases ER visits for respiratory illness by 0.36%. The effect is positive and significant for all age groups. Furthermore, the coefficients on government environmental alerts suggest that avoidance behavior becomes increasingly significant across all age groups as restrictions become more severe.