某些城市的测量甚至包括PM 2.5等更小的微粒，这些也被收入数据库之内。
In some cities, measurements of even smaller particles such PM2.5 are available, and these are also included in the database.
某些城市的测量甚至包括PM 2.5等更小的微粒，这些也被收入数据库之内。
In some cities, measurements of even smaller particles such PM2.5 are available, and these are also included in the database.
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