Environmental Science
The gas that shows the most variation from place to place and from time to time in the lower atmosphere:

Methane (CH4)
Carbon dioxide (CO2)
Ozone (O3)
Argon (Ar)
Water vapour (H2O)

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Environmental Science
Which of the following statements is not correct?

The length of human hair changes as the relative humidity changes.
The relative humidity is a measure of the air's actual water vapor content.
A change in the air temperature can change the relative humidity.
During the winter, low relative humidity can irritate the mucus membranes in the nose and throat.

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