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If you're in the south of Invercargill or the west of Alexandra, there's a good chance your air quality is much worse than people elsewhere in town.
NIWA has mapped outdoor air quality for Invercargill and Alexandra, and found some homes can have three times as much air pollution as others, depending on where they are.
And that doesn't mean those households are bad polluters - it's just a case of where the wind blows.
NIWA principal air quality scientist Ian Longley spoke to Corin Dann.