What is the reason for more and more children in metro cities of India suffering from allergies and asthma?

Step-by-step solution

The exaggerated response of the immune system to certain antigens present in the environment is called allergy. The substances to which such an immune response is produced are called allergens. Children in metropolitan areas have a sensitivity to the environment. The symptoms of allergic reactions include sneezing, watery eyes, running nose and difficulty in breathing. The antibodies produced to allergens are of IgE type.For determining the cause of allergy, the patient is exposed to or injected with very small dos