Table 3.
Average air pollution concentrations and other environmental variables in the last seven days before survey (n = 31,806).
| Freshman Cohort | 2013–2014 Cohort (n = 5979) a | 2014–2015 Cohort (n = 8155) b | 2015–2016 Cohort (n = 5929) c | 2016–2017 Cohort (n = 5305) d | 2017–2018 Cohort (n = 6438) e | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Survey Order | 9–15 Dec | 5–11 May | 6–12 Oct | 24 Feb–2 Mar | 4–10 May | 14–20 Sep | 2–8 May | 21–27 Nov | 15–21 May | 13–19 Nov | 30 Apr–6 May |
| AQI | 66.43 (30.59) | 85.85 (26.31) | 234.00 (145.86) | 104.71 (67.98) | 67.71 (11.63) | 116.00 (51.36) | 76.57 (40.97) | 115.13 (108.73) | 120.51 (46.24) | 61.96 (28.25) | 96.35 (48.43) |
| PM2.5 (µg/m³) | 45.00 (26.28) | 59.14 (27.52) | 194.29 (143.70) | 72.29 (57.49) | 41.47 (13.16) | 87.14 (41.54) | 39.57 (17.42) | 85.85 (101.17) | 61.86 (22.72) | 36.11 (27.02) | 38.23 (23.61) |
| PM10 (µg/m³) | 65.71 (34.52) | 95.29 (30.98) | 194.43 (128.11) | 103.29 (76.98) | 79.57 (26.37) | 109.28 (39.31) | 80.71 (52.10) | 115.06 (123.85) | 120.49 (32.38) | 70.38(32.72) | 132.13 (77.78) |
| NO2 (µg/m³) | 34.43 (10.49) | 61.14 (13.31) | 103.00 (39.24) | 61.28 (24.42) | 40.00 (9.92) | 63.29 (13.78) | 44.43 (17.82) | 64.10 (45.05) | 49.28 (22.91) | 49.07 (23.43) | 46.61 (17.86) |
| Covariate variables | |||||||||||
| Temperature (°C) | 5.43 (1.40) | 20.71 (3.09) | 20.86 (1.86) | 6.29 (3.45) | 21.43 (5.16) | 27.00 (0.82) | 25.57 (2.44) | (5.57) (1.72) | 20.86 (5.18) | 2.29 (2.21) | 19.43 (1.99) |
| Wind (m/s) | 3.57 (0.67) | 3.14 (0.24) | 3.43 (0.73) | 3.79 (0.91) | 3.01 (0.19) | 3.00 (0.00) | 3.14 (0.24) | 3.29 (0.06) | 3.15 (0.24) | 3.71 (0.95) | 3.35 (0.56) |
| Rain (%) | 0.00 (0.00) | 0.43 (0.54) | 0.14 (0.38) | 0.14 (0.38) | 0.57 (0.54) | 0.14 (0.38) | 0.29 (0.49) | 0.00 (1.00) | 0.14 (0.38) | 0.00 (0.00) | 0.00 (0.00) |
Air pollution data collection periods a 2013–2014 cohort: 9–15 December 2013, 5–11 May 2014; b 2014–2015 cohort: 6–12 October 2014, 24 February–2 March 2015, 4–10 May 2015; c 2015–2016 cohort: 14–20 September 2015, 2–8 May 2016. d 2016–2017 cohort: 21–27 November 2016, 15–21 May 2017. e 2017–2018 cohort: 13–19 November 2017, 30 April–6 May 2018.