OZ1

• The atmosphere is made up of:

  • 78% N2
  • 21% O2
  • 1% Ar
  • 399 ppm CO2
  • + others
• To convert from ppm to %:

  1. Divide ppm by 1,000,000
  2. Multiply by 100 to get the percentage
• CO2 has the concentration of 399 ppm in the atmosphere, this is 0.0399%
• To convert from % to ppm: do the opposite, (overall) multiply by 10,000
• N2 has the concentration of 78% in the atmosphere, this is 780,000 ppm
• Some of the polluting gases in the atmosphere:

  A) Water

  B) Methane

  C) Carbon dioxide

  D) CFCs