Table 3 Summary of 24-h mean concentration of air pollutants and meteorological variables
From: The effects of weather, air pollutants, and Asian dust on hospitalization for asthma in Fukuoka
Variables | No. of days analyzed | Mean (SD) | Minimum | Percentiles | Maximum | ||
|---|---|---|---|---|---|---|---|
25th | 50th | 75th | |||||
Air pollutants | |||||||
SPM (μg/m3) | |||||||
All days | 2506 | 35.9 (17.7) | 7.9 | 23.9 | 31.2 | 43.8 | 213.0 |
AD-days (March–May) | 97 | 62.8 (34.7) | 22.1 | 44.0 | 53.6 | 67.7 | 213.0 |
Non-AD days (March–May) | 543 | 34.3 (13.4) | 10.6 | 25.1 | 31.8 | 40.5 | 95.2 |
Ox (ppb) | |||||||
All days | 2466 | 26.7 (11.8) | 1.2 | 17.6 | 26.4 | 34.9 | 69.6 |
AD-days (March–May) | 94 | 39.5 (9.5) | 19.1 | 33.0 | 39.9 | 44.8 | 69.6 |
Non-AD days (March–May) | 517 | 35.7 (10.5) | 7.9 | 28.3 | 36.7 | 43.2 | 65.5 |
NO2 (ppb) | |||||||
All days | 2485 | 18.1 (7.5) | 2.3 | 12.5 | 17.5 | 23.2 | 50.6 |
AD-days (March–May) | 92 | 17.6 (6.9) | 4.5 | 12.5 | 17.5 | 22.3 | 35.0 |
Non-AD days (March–May) | 537 | 17.9 (7.2) | 3.5 | 12.2 | 17.5 | 22.9 | 45.8 |
SO2 (ppb) | |||||||
All days | 2494 | 4.5 (1.6) | 0.9 | 3.3 | 4.3 | 5.3 | 14.2 |
AD-days (March–May) | 91 | 5.5 (1.6) | 2.4 | 4.3 | 5.5 | 6.6 | 9.4 |
Non-AD days (March–May) | 545 | 4.9 (1.7) | 0.9 | 3.7 | 4.7 | 6.0 | 11.3 |
Meteorological variables | |||||||
Temperature (°C) | |||||||
All days | 2551 | 17.3 (7.8) | −1.4 | 10.5 | 17.7 | 24.0 | 31.9 |
AD-days (March–May) | 98 | 14.9 (3.5) | 5.1 | 12.8 | 14.6 | 16.5 | 24.2 |
Non-AD days (March–May) | 545 | 15.2 (4.9) | 2.1 | 11.8 | 16.0 | 19.1 | 26.6 |
Within-day temperature drop (°C) | |||||||
All days | 2556 | 4.1 (1.7) | 0.2 | 2.9 | 4.0 | 5.2 | 12.3 |
AD-days (March–May) | 98 | 5.0 (1.8) | 1.2 | 3.8 | 4.9 | 6.2 | 11.4 |
Non-AD days (March–May) | 546 | 4.4 (1.9) | 0.8 | 3.1 | 4.2 | 5.4 | 12.3 |
Within-day temperature rise (°C) | |||||||
All days | 2556 | 5.3 (2.7) | 0.2 | 3.2 | 5.1 | 7.1 | 15.0 |
AD-days (March–May) | 98 | 5.9 (3.3) | 0.6 | 2.9 | 5.5 | 8.7 | 12.6 |
Non-AD days (March–May) | 546 | 5.8 (3.1) | 0.2 | 3.3 | 5.7 | 8.2 | 15.0 |
Relative humidity (%) | |||||||
All days | 2551 | 66.7 (11.0) | 28.3 | 58.7 | 66.8 | 74.3 | 95.7 |
AD-days (March–May) | 98 | 57.8 (10.8) | 28.3 | 51.0 | 57.8 | 65.4 | 84.9 |
Non-AD days (March–May) | 545 | 65.2 (13.0) | 31.1 | 55.0 | 64.1 | 75.4 | 95.7 |