报告人： Per Johansson, Professor in statistics, Department of statistics, Uppsala University
时间：2016-10-28 14:00 ~ 15:30
On normal days, the temperature decreases with altitude, allowing air pollutants to rise and disperse. During inversion episodes, a warmer air layer at higher altitude traps pollutants close to the ground. We show how readily available NASA satellite data on vertical temperature profiles can be used to measure inversion episodes on a global scale with high spatial and temporal resolution. Then, we link inversion episode data to ground level pollution monitors and to daily in- and outpatient records for the universe of children in Sweden during a six-year period to provide instrumental variable estimates of the effects of air quality on children’s health. The IV estimates show that the respiratory illness health care visit rate increases by 8 percent for each 10μm/m? increase in PM10; an estimate four times higher than conventional estimates. Importantly, by linking the health care data to detailed records of parental background characteristics, we show that children from low-income households suffer significantly more from air pollution than children from high income households. Finally, we provide evidence on the importance of several mechanisms that could contribute to the difference in the impact of air pollution across children in rich and poor households.
About the Speaker:
Per Johansson is professor of Statistics at the Department of Statistics, a researcher at the Institute for Labour Market and Education Policy Evalution, IFAU and a scientific advisor at the Inspectorat of Social Insurence, ISF. Per holds a Philosophy Licentiate (1992) from the Stockholm School of Economics and a Ph. D. (1993) from Ume? University. In 2002 – 20015 he was a professor in econometrices at the department of economics, Uppsala university. His research deals with the analysis of micro data in general (both methodological and applied). The applied work has mainly been in labor economics and health (e.g. effects of income security systems on labor market behavior, program evaluation, and economics of education) but he has also done research in transport economics. Publications include papers in Journal of Econometrics, Journal of European Economic Association, Journal of Business and Economic and Statistics, Journal of Public Economics, Journal Labor Economics,Journal of Applied Economerics, Journal of Royal of Statistcs Society, Journal of Health Economics, Journal of Human Resources and Transportation Research.