It used to be that people could step outside and take a deep, long breath of fresh air. Now, brief whiffs can bring odors so unpleasant and even harmful to health. Outdoor air pollution can cause a significant harm in our respiratory system. Outdoor air pollutants include particulate matter or floating solid matter that may be visible or microscopic. Respiratory Therapist Jobs are necessary to help people take proactive steps in maintaining good health even when living in urban areas.