Question

When you go to a new place and suddenly you start sneezing, wheezing for no explained reason and when you go away, your symptoms disappear. Why is it so?

Answer 1

When we or a person goes into a new place and suddenly starts sneezing this is because the unknown place might be dusty and those dust particles enter and the immune cells could not understand the difference between the new and old cells. Sneezing and wheezing results in a sudden pressure where all the particles entering in the body exerts out in force.

Complete answer:
Sneezing and wheezing occurs when some sort of dust or mites enter the body via nose or mouth while inhalation. In any place these dust particles can enter the body causing inflammation and allergies. Allergies are immunogenic responses which our immune cells show in order for protection.
Immune cells like- mast cells produce histamine and serotonin which are chemicals to protect the body from infections. These intricate things can hamper the body and can cause infection like cold or severe allergic issues which can require treatment.
There are allergies based on severity. Mild allergies which can be automatically treated by the IgE antibodies and severe ones are required drugs for the treatment.
A wide variety of substances can be considered as allergens such as pollen grains, animal hairs, dust mites, dander. Symptoms for the allergies can be visible in naked eye like-sneezing and apart from sneezing, coughing when microbes or dust particles tries to enter from mouth or throat, itchiness, runny eyes and nose.
Some people are prone to certain kinds of food allergies too. The foreign particles which enter the body via any medium are termed as allergens. So, if a person has a food allergy, symptoms shown will be- vomiting, itching hives, nausea, diarrhea, stomach pain etc.

Note:
As we knew about what are the factors that causes allergies, there are some more- such as insect stings or their venoms when an insect bite like mosquito the immediate allergies we see on body is rashes and itchiness and swellings of that particular area as the inflammatory chemicals accumulate to kill the toxins that the insect tried to insert into the body. After quite a time the inflammation will be normal or it requires some external help to settle down.