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Table 3 Levels of gaseous pollutants on heavy–AD and non–heavy AD days, by definition type

From: Estimation of the effects of heavy Asian dust on respiratory function by definition type

Type of day (number of days)

NO2

(ppb)

Ozone

(ppb)

SO2

(ppb)

Heavy–AD days, as per the definition by the JMA (n = 5)

3.5

± 1.3

57.6

± 10.9

2.0

± 1.0

Non–heavy AD days, as per the definition by the JMA (n = 87)

2.8

± 1.2

50.1

± 8.4

1.0

± 0.7

Heavy–AD days defined by daily median level ≥ 0.07 km−1 (detected by LIDAR) (n = 5)

3.7

± 1.3

52.2

± 10.4

1.3

± 0.9

Non–heavy AD days, defined by daily median level ≥ 0.07 km−1 (detected by LIDAR) (n = 87)

2.7

± 1.1

50.4

± 8.6

1.0

± 0.8

Heavy–AD days, defined by hourly level ≥ 0.1 km−1 (detected by LIDAR)

(n = 8)

3.3

± 1.2

52.9

± 10.5

1.4

± 0.9

Non–heavy AD days, defined by hourly level ≥ 0.1 km−1 (detected by LIDAR) (n = 84)

2.8

± 1.2

50.3

± 8.5

1.0

± 0.8

Heavy–AD days, defined by hourly level ≥ 0.07 km−1 (detected by LIDAR)

(n = 20)

3.0

± 1.0

54.3

± 9.2

1.4

± 0.8

Non–heavy AD days, defined by hourly level ≥ 0.07 km−1 (detected by LIDAR) (n = 72)

2.7

± 1.2

49.5

± 8.3

0.9

± 0.8

  1. AD Asian dust, JMA Japan Meteorological Agency, LIDAR light detection and ranging, NO 2 nitrogen dioxide, SO 2 sulfur dioxide