Discussion
Which of the following best explains why fine particulate is a regional problem?
Answer: D
Correct answer: Its residence time allows long transport
Fine particulate stays airborne for days to weeks - too small to settle appreciably under gravity, too large to be removed quickly by coagulation - so the prevailing wind carries it hundreds of kilometres before wet or dry deposition removes it.
The consequence is that a city's measured PM2.5 includes a substantial contribution emitted or formed well outside its boundary, and that local measures alone cannot bring it down. It is emitted and formed everywhere, not only in rural areas, and it is measured throughout the network rather than only at regional sites.
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