Guests are even asked to keep their windows closed at night to help the same cause.

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Keep the windows closed and the air-conditioning on, giving you an allergen free bubble.

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Once inside, keep your windows closed, change your air filters, and run your air conditioner, Dr. Kao adds.

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Residents in the immediate area are being advised to keep windows and doors closed until further notice.

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Emergency officials in southern Kent advised residents "to keep doors and windows closed due to a gas cloud".

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Thick black smoke drifted across the M1 following the fire, and residents living near the scene were advised to keep their doors and windows closed.

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More than 40 firefighters were tackling the flames at the height of the fire and people nearby were warned to keep their doors and windows closed.

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