What air borne particles can affect your vision?

Several. Aside from allergens such as pollen, dust and pet dander, chemicals such as smoke can cause dry eyes and blurred vision. Aerosolized cleaning products may be acidic or basic and if they get into the eyes, can cause irritation and blurred vision as well.
Allergies. Aside from obvious foreign bodies such as sand or other debris allergens probably pose the most risk. In our area of the country, the pollen can be so heavy it forms a coating on the ground and objects. If the eye is irritated the tear can become thickened and blurring can result. Antihistamine drops and artificial tears can help - if it persists, be examined by an ophthalmologist.