The WHO says three million deaths a year are linked to exposure to outdoor air pollution.
A spokesman told NBC News the militant group's leadership had hoped that Afghanistan would feature more prominently in the discussion.
A young girl made a plea to address racial bias in emotional remarks to Charlotte's City Council.
No one was injured in the blasts, which officials said likely had "xenophobic" motive.
From Mexico City to Hong Kong, there was a lot of interest in the first presidential debate.