Discussion
Which of these is NOT a reason ammonia matters to air quality?
Answer: A
Correct answer: It is a strong stratospheric ozone depleter
Ammonia has nothing to do with stratospheric ozone. It is highly soluble and reactive, so it is removed within the lower troposphere in hours to days and never reaches the stratosphere - unlike the inert chlorofluorocarbons, which survive to be photolysed there.
The other three are all genuine reasons it matters. It arises mainly from agriculture, it neutralises sulphuric and nitric acid to form ammonium sulphate and nitrate, and those salts contribute a substantial share of fine particulate mass, including in cities far from any farm.
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