Outdoor allergies range from the smallest particles such as dust and pollen to insects such as mites or mosquitoes. Also you can also get allergies from various plants such as grass and shrubs.
Hay fever (which is to pollen and mold), grass pollen allergies, ragweed, mold (inside and outside), and to insect bites. You can have a combination of them, and an allergist can test you for specific allergies.
Ragweed is the most common. There are people that are allergic to sunlight. People are also allergic to grass and various kinds of flowers. Dandelions are another very common one.