do you have to be high up to measure air pollution?

Question: do you have to be high up to measure air pollution?
- Keywords:
  air pollution,
  high,
  measure
Asked by anon-177042 to Daniel on 15 Jun 2018.
- Daniel Marsh answered on 15 Jun 2018:
  
  Most of our measurements are made between ground level and below 4 meters as this is the ‘breathing zone’ and represents the air that you are actually sucking into your lungs. The chemistry of air does change with height so this is a very good question!

Question: do you have to be high up to measure air pollution?