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 ...
Guessing Headlights on MSN
This Delta flight's mystery odor was so bad the pilots had to put on oxygen masks mid-air
A routine Tuesday morning flight from Miami to Minneapolis turned into a 10-hour nightmare for 111 passengers when Delta ...
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