Table 1 Summary statistics for PM ₁₀ , spatially resolved PM ₁₀ , SO ₂ , NO ₂ , daily mean temperature, daily mean relative humidity and daily IHD death counts in Beijing between 2008 and 2009

PM₁₀(μg/m³)*^a

Spring

7.0

80.0

124.0

184.0

600.0

144.5

96.3

Summer

5.0

64.0

98.0

134.0

463.2

101.4

52.2

Autumn

7.0

54.0

94.0

148.0

553.0

110.1

75.9

Winter

7.0

62.0

108.0

170.0

600.0

127.7

88.7

Overall

5.0

64.0

104.0

150.0

600.0

120.8

81.6

Spatially resolved PM₁₀(μg/m³)^b

Spring

13.1

84.9

125.4

186.7

593.1

147.6

93.4

Summer

17.3

69.0

98.8

1338

432.0

103.7

50.4

Autumn

11.3

61.3

99.1

150.8

489.9

114.9

75.1

Winter

13.2

61.6

96.9

144.4

600.0

114.9

78.8

Overall

11.3

68.0

104.2

150.7

600.0

120.3

78.1

SO₂(μg/m³)

Spring

6

14.0

25.0

39.8

138

30.7

22.7

Summer

6

8.0

11.0

14.0

44

12.5

6.7

Autumn

6

12.0

16.0

29.0

136

24.9

21.8

Winter

10

39.3

72.0

102.0

202

75.7

42.3

Overall

6

12.0

21.0

46.0

202

36.0

35.6

NO₂(μg/m³)

Spring

16

41.6

49.6

59.2

152

51.6

18.4

Summer

14.4

28.8

40.0

44.8

62.4

37.9

11.0

Autumn

19.2

40.0

52.8

67.2

142.4

58.2

26.6

Winter

9.6

40.0

59.2

80.6

140.8

60.6

25.9

Overall

9.6

36.8

48.0

60.8

152

52.2

23.2

T(°C)

Spring

-0.1

10.0

15.6

20.6

26.8

15.2

6.5

Summer

17.5

24.3

26.0

28.0

31.6

26.0

2.7

Autumn

-2

7.1

15.1

19.9

25.4

13.4

7.6

Winter

-9.4

-3.5

-1.5

0.5

9.4

-1.3

3.4

Overall

-9.4

2.3

15.4

23.55

31.6

13.4

11.1

RH(%)

Spring

15

30.0

44.0

56.0

95

44.8

18.2

Summer

19

57.0

68.0

76.0

90

64.8

15.5

Autumn

19

44.0

60.5

71.0

88

57.2

18.0

Winter

11

24.0

38.0

53.0

82

39.8

17.4

Overall

11

35

53

68

95

51.7

19.9

IHD(N)

Spring

20

32.8

37

42

57

37.3

7.3

Summer

19

28

32

37

49

32.5

6.4

Autumn

18

34

40

46

67

41.0

9.8

Winter

29

43

49

55

75

49.1

8.4

Overall

18

33

39

46

75

39.9

10.1