Table 4 Comparison of meteorological variables and air pollutants between 2016 and 2017 study periods and prior months, T-test

Mean Pressure

1018.78 (3.22)

1023.25 (5.19)

.004

**

1007.9 (2.02)

1004.01 (3.74)

.001

**

Max Temp

19.54 (2.12)

14.75 (3.54)

 < .0005

**

31.04 (1.82)

32.37 (1.53)

.017

*

Mean Temp

17.82 (1.77)

12.73 (3.75)

 < .0005

**

28.37 (1.22)

29.94 (1.02)

 < .0005

**

Min Temp

16.38 (1.93)

10.91 (4.16)

 < .0005

**

26.57 (1.07)

27.93 (1.26)

 < .0005

**

Dewpoint Temp

15.1 (2.35)

9.19 (6.49)

.004

**

25.46 (0.35)

25.85 (0.54)

.005

**

Rel. Humidity

84.4 (7.69)

80.53 (15.68)

.390

84.74 (5.71)

79.06 (4.62)

.001

**

Cloud cover

74.1 (21.2)

85.53 (21.59)

.127

80.11 (9.23)

73.88 (13.04)

.071

Rainfall

8.52 (14.55)

7.2 (13.17)

.784

21.11 (42.37)

8.55 (16.25)

.250

Sunshine Hrs

2.64 (3.23)

1.59 (3.38)

.356

4.84 (3.53)

6.29 (3.76)

.203

Wind Speed

26.82 (10.84)

30.92 (13.17)

.320

21.5 (6.15)

22.82 (9.36)

.576

Wind Direction (South = 0)

131.50 (18.14)

144.00 (18.44)

.053

72.59 (40.44)

65.88 (28.08)

.553

Air pollutants

 Mean CO

99.52 (10.39)

85.07 (21.51)

.027

*

47.24 (3.25)

56.12 (12.1)

.009

**

 Mean NO₂

50.14 (11.21)

48.01 (14.23)

.623

25.18 (4.62)

36.05 (12.8)

.003

**

 Mean NO_X

81.41 (26.65)

95.22 (39.19)

.223

49.96 (12.87)

60.51 (14.73)

.016

*

 Mean O₃

37.07 (15.46)

24.99 (15.26)

.028

*

21.71 (3.9)

38.57 (24.61)

.012

*

 Mean SO₂

7.49 (2.13)

7.38 (2.4)

.887

5.34 (1.21)

8.37 (2.9)

.001

**

 Mean RSP^a

39.89 (18.35)

30.07 (14.67)

.098

12.89 (2.22)

26.78 (16.39)

.003

**

 Mean FSP^a

29.07 (12.91)

20.52 (9.27)

.037

*

7.1 (1.51)

16.44 (12.68)

.008

**