Can allergies cause long term shortness of breath. I worked in sawmill and found out im really allergic to maple?

Asthma. Allergies can trigger asthma / shortness of breath. Please see an allergy specialist for appropriate. Test and treatment.
Depends. Specific allergy to environmental agents like maple wood in a sawmill could cause chronic shortness of breath . A lung test and x-ray may help in evaluation.
Shortness of Breath. Allergies that cause shortness of breathasthma can manifest itself as wheezing, shortness of breath, coughing, or all of the above. A large percentage of the time, regular pollen/dust mite/mold and other allergens.