A reliable indicator of the air quality in offices, classrooms, or living rooms is the CO2 content. In fresh air, the concentration of carbon dioxide is around 400 ppm. This stands for “parts per ...
5 Top Small SUVs of 2014 01:40 Small SUVs combine practicality, fuel efficiency, and all-weather traction. The Subaru Forester tops Consumer Reports Ratings. Other great small SUVs include the Honda ...
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