A new report on air quality across the United States offered a cloudy prognosis on the long-term health of about 156 million residents who live in areas that received an "F" in smog and soot pollution ...

Data: American Lung Association; Note: Days where air pollution was worse received a greater weighting in the calculation; Chart: Alex Fitzpatrick/Axios Houston continues to be one of the most ...

SARAJEVO (Reuters) - A blanket of fog and smog descended on the Bosnian capital of Sarajevo this week, reducing daytime visibility to a few dozen metres and forcing residents indoors as pollution ...