Smoke from the wildfires ravaging south-western France has drifted into Switzerland, the federal weather service MétéoSuisse says.
Officials stress the concentration is far too low to pose a health risk, but it is causing a visible haze and can occasionally be smelt in some areas.
South-westerly winds are expected to keep sending smoke across the country in the coming days, though not densely enough to affect temperatures.
MétéoSuisse describes the impact on daily life as limited to slightly hazier skies.
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