A fundamental shortcoming in air pollution models

Researchers from the University of Copenhagen have discovered a surprising phenomenon in a process by which certain gas molecules produce harmful particles. The impact of this phenomenon is likely to increase in urban areas ...

When the big yellow bus goes green

Every year, car manufacturers roll out new models with sleek styling, improved safety features and better fuel economy. Yet there's one vehicle on the road that has remained almost unchanged since the 1970s: the yellow school ...

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