The report covers 181 air toxics and diesel particulate matter and estimates risks from exposure to emissions from industrial sources and mobile sources such as cars and trucks.

这份报告涵盖了181种空气毒物和内燃机颗粒物，并且估计了暴露于工业源和移动源例如汽车和卡车的排放物的风险。

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The EPA actually began regulating mobile GHG sources first as the trigger for applying permitting programs under their interpretation of the CAA to stationary sources.

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Traditional web growth sources are a bit different from mobile app growth sources e.g. app store SEO is much different than web SEO, and both offer some level of growth potential.

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He points to logistics companies, major retailers and mobile telecommunications as sources of innovation in non-financial services, and to genetically modified seeds as the most prominent example in agriculture.

ECONOMIST: Economics focus