air quality sensor placing on a table indoor. sensor found small amount of air pollution of PM 2.5 the poisonous harmful particulate matter invisible dust from open field fire. man-made disasters.

air quality sensor placing on a table indoor. sensor found small amount of air pollution of PM 2.5 the poisonous harmful particulate matter invisible dust from open field fire. man-made disasters. - 143103749

Smart watch with digital display on the table in front of the window

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