995 resultados para Traffic police


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National Highway Traffic Safety Administration, Washington, D.C.

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Mode of access: Internet.

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National Highway Traffic Safety Administration, Washington, D.C.

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National Highway Traffic Safety Administration, National Center for Statistics and Analysis, Washington, D.C.

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National Highway Traffic Safety Administration, Washington, D.C.

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Description based on: Year 1953; title from cover.

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On cover: Illinois traffic safety programs, report of evaluation or assessment.

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Mode of access: Internet.

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General note: Title and date provided by Bettye Lane.

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Air pollution levels were monitored continuously over a period of 4 weeks at four sampling sites along a busy urban corridor in Brisbane. The selected sites were representative of industrial and residential types of urban environment affected by vehicular traffic emissions. The concentration levels of submicrometer particle number, PM2.5, PM10, CO, and NOx were measured 5-10 meters from the road. Meteorological parameters and traffic flow rates were also monitored. The data were analysed in terms of the relationship between monitored pollutants and existing ambient air quality standards. The results indicate that the concentration levels of all pollutants exceeded the ambient air background levels, in certain cases by up to an order of magnitude. While the 24-hr average concentration levels did not exceed the standard, estimates for the annual averages were close to, or even higher than the annual standard levels.