The sample (n = 125) is restricted to DSP locations within 150 km of an air quality monitoring station. TSP (μg/m3) in the years 1981–2000 before the DSP
period is used to calculate city-specific averages. Degree days are the deviation of each day’s average temperature from 65°F, averaged over the years 1981–
2000 before the DSP period. The results in column (4) are adjusted for a cubic in degrees of latitude north of the Huai River boundary. Predicted life
expectancy is calculated by OLS using all of the demographic and meteorological covariates shown. All results are weighted by the population at the DSP
location. One DSP location is excluded due to invalid mortality data. *Significant at 10%, **significant at 5%, ***significant at 1%. Sources: China Disease
Surveillance Points (1991–2000), China Environment Yearbook (1981–2000), and World Meteorological Association (1980–2000).