Table 2 Average measured pollutant concentrations over different time periods in the Mexico City Metropolitan Area, February 2002

PM_2.5, mean (μ g/m³)

14

11

14

12

14

12

14

12

(3314, 12)

(10)

(3140, 9)

(11)

(2939, 8)

(9)

(2733, 8)

(8)

Ozone, max (ppb)

84

69

85

73

87

77

89

83

(4406, 66)

(65)

(4118, 52)

(66)

(3832, 46)

(73)

(3550, 43)

(65)

CO, max (ppm)

6

2

6

2

6

3

6

3

(4353, 8)

(8)

(4086, 7)

(10)

(3806, 6)

(10)

(3524, 6)

(9)

CO₂, max (ppm)

461

426

462

431

462

433

462

432

(4371, 97)

(96)

(4088, 79)

(106)

(3802, 73)

(104)

(3520, 69)

(105)

Formaldehyde, max (ppb)

35

23

34

25

35

26

35

27

(1784, 39)

(26)

(1663, 26)

(30)

(1519, 24)

(31)

(1379, 23)

(34)

NO₂, max (ppb)

130

68

131

69

130

71

128

74

(4406, 135)

(114)

(4118, 121)

(137)

(3832, 114)

(155)

(3550, 108)

(156)

NO_x, max (ppb)

131

23

131

23

130

25

128

25

(4406, 187)

(186)

(4118, 176)

(240)

(3832, 169)

(237)

(3550, 161)

(226)