the other in an area with lower pollution concentrations (n = 79,
PM10 mass = 223.0 and PM2.5 mass = 28.5 g/m3). The BP of children
from the school in the highly polluted area was significantly
higher than that of children attending the school in the less
polluted area (115.9/70.9 and 108.3/66.4 mmHg, respectively),
with adjustment of age, sex, height, weight, social-economic
status, passive smoking and the urinary concentrations of Na, K
and creatinine. Although informative, this study did not consider
the effect of traffic noise on the results.