smog News

LOS ANGELES — Developers of a multi-rotor hover craft billed as the first flying vehicle to be powered by hydrogen fuel cells unveiled a full-scale model on Wednesday in Southern California, in a show-and-tell that raised some eyebrows but never …

One of Beijing’s worst rounds of air pollution kept schoolchildren indoors and sent coughing residents to hospitals Monday, but this time something was different about the murky haze: the government’s transparency in talking about it. While welcomed by residents and …