Lei Answers Jack Ma Pollution Jibe With Air Purifier

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It was a mild barb from one Chinese technology tycoon to another. At an Internet conference last month, Jack Ma asked Xiaomi Corp.’s Lei Jun how much making a good smartphone mattered when the air and water were so bad?

Today, Lei responded by unveiling a home air purifier that sends pollution readings to mobile phones and alerts users when its filter’s dirty. In doing so, Xiaomi -- the world’s third-largest smartphone maker -- follows Ma’s Alibaba Group Holding Ltd. in offering mobile technology catered to the environmental concerns of Chinese consumers.