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Ambient air pollution is mainly made up of fine particulate matter (PM10 and PM2.5). PM2.5 includes pollutants such as sulfate, nitrates and black carbon, which pose the greatest risks to human health.

Amazon’s newly published patent envisions a fleet of airships that would monitor delivery drones. (Amazon Illustration via USPTO)

Among the athletes were three Americans, two New Zealanders, one Dutch, one Italian and one Brazilian, a police officer said, requesting anonymity ahead of an official announcement. He said most had minor injuries but an American female water polo player required surgery. The other two Americans — a man and a woman — are also water polo players, the police officer said.

Amazon’s voice assistant joins a high-profile voice cast in the release today of the first three episodes of “Starfinder,” the futuristic role playing game that is now an audio adventure in which players use their voices to control the action.

Among small businesses with financing shortfalls, 73.7 percent require less than 500,000 yuan and 96 percent need less than 1 million yuan.