Table 3.

Percentage changes in human mobility to various types of places, including grocery-pharmacy, workplaces, transit stations, and parks in the eleven study regions between March–May of 2020 and the baseline (median value from the five-week period ranging from January 3 to February 6, 2020). The column “Residential” refers to percentage changes in the amount of time people stayed in their residential areas compared to the baseline. The column “PM_2.5 Change” also shows the percentage changes in the mean PM_2.5 levels between March–May of 2020 and 2019. All numbers represent percentages.

Region	PM2.5 Change	Grocery-Pharmacy	Workplace	Residential	Transit Stations	Parks
Washington DC	−21.1	−14.40	−43.69	18.44	−47.28	16.53
New York	−20.7	−14.57	−47.19	20.34	−53.35	−3.64
Boston	−18.5	−16.25	−47.63	20.43	−57.38	13.14
Detroit	−13.53	−11.35	−44.72	17.26	−32.22	63.68
Chicago	−8.05	−3.51	−37.21	15.09	−31.79	19.32
Seattle	−7.73	−11.33	−45.46	17.86	−44.98	26.78
Dallas	−6.71	−4.36	−36.48	14.64	−24.67	14
Philadelphia	−4.82	−11.09	−39.75	15.76	−44.45	11.94
Houston	−3.63	−1.49	−34.37	14.26	−13.09	9.17
Los Angeles	−3.29	−10.39	−37.33	17.14	−41.66	−23.56
Phoenix	5.5	−7.00	−34.13	12.32	−31.16	−11.15