Prevalent allergen.

During the past few years. In the United States has caused a phenomenon peculiar to each. During the spring, that is, people coughing, sneezing, asthma, allergies, and it is easier and more often without knowing the cause of a past study found that lifestyle changes with air pollution. However, a major cause of such symptoms. The new research. Pointed out that The critical temperature, global warming and carbon dioxide levels. In more air. The cause of various plants. Leaves faster. The amount of pollen is spread by air, it's more like it. People with allergies or asthma on inhalation of these particles are not. The simple recurrent symptoms.