Asthma not the same as cold allergy
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Cold allergy and hives are caused by exposure to especially cold water. Urticaria due to cold or cold water can cause severe reactions like swelling on large parts of the body. Cold Allergy could be one cause of allergic shock. Cold Allergy triggered most often by swimming in very cold water.
In cities and towns are cold days with little wind and high traffic volume result in increased concentrations of gases and particles in the air. Nitrogen dioxide, NO2 from combustion engines (older cars) can contribute to increased air pollution.
Especially people with asthma may react to NO2 with impaired lung function. In Norway it is particularly exhaust from diesel engines that contribute to increased pollution outside. Along with traffic will also fireplace on cold days to be a significant source of polluted air with a lot of particulate matter. Here come the biggest emissions from old wood stoves.
Particulate matter can both trigger and worsen the disease in people with chronic respiratory disorders. Particulate matter may also be carriers of allergens that can trigger allergies.
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