School number and location | No. of children | Truck traffic density (vehicles/24 h) | Car traffic density (vehicles/24 h) | Distance of school from motorway (m) | Distance of home from motorway (m), median (min–max) | Outdoor PM10 (μg/m3) | Indoor NO (μg/m3) | |||
Same day* † | Lag 1* ‡ | Lag 2* § | Lag 3* ¶ | |||||||
1 Sliedrecht | 85 | 13934 | 63476 | 170 | 259 (97–800) | 16.0–17.3 | 16.3–21.1 | 21.1–25.2 | 25.2–53.1 | 6.3–9.6 |
2 Gorinchem | 43 | 16571 | 68382 | 125 | 377 (50–958) | 24.3–26.1 | 17.3–26.1 | 16.3–17.3 | 16.3–21.1 | 12.3–39.3 |
3 Badhoevedorp | 56 | 10404 | 111998 | 74 | 442 (42–976) | 33.3 | 33.4 | 36.9 | 51.5 | 83.0 |
4 Badhoevedorp | 212 | 10404 | 111998 | 237 | 404 (50–901) | 17.2–33.0 | 17.2–33.3 | 17.2–33.4 | 33.3–36.9 | 29.0–50.3 |
5 Bergen op Zoom | 80 | 6738 | 43170 | 247 | 270 (65–906) | 60.1 | 58.0 | 77.2 | 100.4 | 13.6 |
6 Rotterdam | 27 | 17085 | 125287 | 168 | 202 (70–295) | 24.0 | 28.6 | 47.5 | 55.0 | 11.3 |
7 Rotterdam | 149 | 16058 | 107467 | 322 | 385 (50–997) | 27.1 | 41.6 | 51.0 | 21.2 | 28.0 |
8 Roosendaal | 94 | 6610 | 42354 | 50 | 220 (32–939) | 46.7 | 37.7 | 27.5 | 20.8 | 22.6 |
9 Sassenheim | 66 | 4845 | 46150 | 250 | 392 (125–982) | 26.0 | 19.4 | 16.9 | 18.7 | 17.3 |
↵* Daily average. If there was more than one measurement day, minimum and maximum values are given.
↵† On day of exhaled NO measurements.
↵‡ 1 day before exhaled NO measurements.
↵§ 2 days before exhaled NO measurements.
↵¶ 3 days before exhaled NO measurements.
PM10, particulate matter with a 50% cut-off aerodynamic diameter of 10 μm.