Stress activation always depends upon how an event is interpreted by how it is perceived. However, there are aspects of our day-to-day environment that can more easily be perceived as being stressful. These are called environmental stressors. An environmental stressor is something that is in our environment that can easily be perceived as annoying, distracting, uncomfortable or unpleasant. Environmental stressors don’t usually involve people, but relate to the conditions of the physical environment. Loud noise can be an example of an environmental stressor.