Discussion
Ammonia emissions in most countries come predominantly from
Answer: D
Correct answer: Agriculture
Agriculture dominates ammonia emissions in most countries, typically contributing 80 to 90 per cent - from livestock manure during housing, storage and spreading, and from the volatilisation of nitrogen fertilisers after application.
Ammonia matters for air quality beyond its own effects because it is the principal atmospheric base: it neutralises sulphuric and nitric acid to form ammonium sulphate and ammonium nitrate, which are major components of fine particulate. Rural ammonia therefore contributes directly to urban PM2.5, and controlling one requires attention to the other.
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