To focus on pollution monitors most likely to reflect population exposures, we excluded monitors intended to capture extreme downwind/upwind pollutant levels, background levels, maximum levels, specific source impacts, and economic impacts.
Because of the mild climatic conditions, children in Mexico City engage in play and outdoor physical activities throughout the year in late morning and afternoon when the diurnal pollutant levels are at their maximum (Villarreal-Calderon et al. 2002).
Because of moderate climatic conditions, children in Mexico City engage in play and outdoor physical activities throughout the year in the late morning and afternoon when the diurnal pollutant levels are at their maximum (Villarreal-Calderón et al. 2002).
Air pollution was assessed on the basis of daily pollutant levels using 24 h averages (µg/m) of SO2, particulate matter (PM10) and NO2 and the maximum value for the 8 h average for O3.
Maximum pollutant exposure did not yield additional evidence of a relation with the excess leukemia risk compared with average levels, and this was particularly true for PM10, suggesting that usual exposure, the one generally monitored by regulatory agencies, is not less informative than peak exposures in influencing disease risk.
"We know the pollutant levels exceed the guidelines so we need to bring them back down.
It predicts first-order behaviour at low concentrations, that is, pollutant removal rates which increase with increasing pollutant concentration; and zero-order or saturated behaviour at high pollutant concentrations, that is, a maximum pollutant removal rate.
Microenvironmental pollutant levels.
Pollutant levels were analysed as continuous variables.
Information about community pollutant levels are provided to the community.
