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Weather conditions, particularly cold air, can sometimes trigger asthma symptoms. It's wise to avoid inhaling cold air by taking precautions such as wearing a special ski mask designed for this purpose. A heavy scarf, worn loosely over the nose and mouth, will also help avoid asthma attacks triggered by cold air.

The weather also affects outdoor allergens, such as pollens and molds. On a windy day more allergens will be scattered in the air, while a heavy rainfall will wash the air clean of allergens.