What factors influence day-to-day allergic reactions?   The environment is absolutely critical. First the obvious, there is a lot less pollen inside than outside. But it's also important to remember that pollen can come in through filter systems, unless you have the right protection to counter that. Protecting your home environment with products that limit pollens entering your home and filter the air within, can have a huge benefit on your health and peace of mind.   The environment also has a bearing in a lot of other ways. If you live in an area where the ozone level is high, you will be more sensitive to the allergy substance. It takes a larger exposure to grass pollen for it to induce allergy symptoms but the ozone level is high, a minimal exposure might make you sneeze and itch.   Another factor that influences when somebody reacts is if they have any sort of a viral infection, like the common cold. The inflammation that results from a cold causes tiny little cracks in the lining of the nose and sometimes in the chest, and that may allow pollen to get through the lining. This may, in turn, trigger an allergy reaction, or it may rev up an allergy reaction that's already occurring.   Do allergies (tree pollen, grass, ragweed) react on people the same way?   The symptoms one gets from tree pollen allergy are exactly the same as grass, ragweed, even symptoms from dust mite or cat allergy. You breathe the allergy substance in and an allergic reaction ensues, giving you the stuffy nose, sneezing, itchy eyes and so on.   Whether or not you have allergies, improving the home environment air quality is important to everyone.   PROTECT YOUR HOME WITH POLLENTEC WINDOW AND DOOR SCREEN AND HVAC AIR FILTERS.