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The haze is likely to ease in the East this weekend but linger in the Upper Midwest, where some cities recorded extremely high pollution indexes on Thursday.
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France and Germany want to quit relying on America and China for key technology like artificial intelligence, but they're having to choose where to do it.
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Also, Trump is set to deliver a prime-time speech on election security. Here's the latest at the end of Thursday.
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The most polluted air in the world today is in three major US cities - where readings are multiple times worse than Delhi, India - due to raging wildfires in Canada.
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Also, the World Cup final is set. Here's the latest at the end of Wednesday.
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