Few study has previously examined the association between air pollution and childhood BP. Sushi’s et al. (2012) explored the effect of particulate air pollution on BP among 179 Pakistani children aged 8–12 years. Two schools were studied; one in a highly polluted area (n = 100, PM10 mass [particles with aerodynamic diameters below 10 micro m] = 728.6 micro g/m3 and PM2. 5 mass [particles with aerodynamic diameters below 2.5 micro m] = 183.0 micro g/m3) and the other in an area with lower pollution concentrations (n = 79,PM10mass = 223.0 and PM2.5mass = 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, Kane keratinize. Although informative, this study did not consider the effect of traffic noise on the results.