Transport-related air pollution is increasingly contributing to environmental health risks in many developing country cities. The social costs of poor urban quality can be significant, making this issue an immediate priority. Long-term measures for dealing with the problem include urban...

In response to emerging epidemiological evidence of the toxicity of diesel vehicular emissions, there is growing interest in substituting conventional diesel with much cleaner natural gas in cities where ambient concentrations of particulate matter are markedly higher than what is...