Although ozone is an highly reactive form of oxygen and unstable, there are some benefits that it is able to provide us with. Below of some positive effects of the ozone.

 Small concentrations of ozone occurs naturally in the stratosphere. which is part of the Earth’s upper atmosphere. At that level, ozone layer do provide us to a certain level of protection, as seen in the diagram below.

By absorbing those ultraviolet radiation, it can help block to certain extent those harmful UV radiation that causes skin cancer, damage crops, destroy some type of marine life  and cataracts.

References:

Charles Welch (n.d.) ‘The Ozone Hole’ Retrieved on 18 March, 2015 from www.theozonehole.com

Larry West (n.d.) ‘Ozone: The Good and Bad of Ozone’ Retrieved on 18 March, 2015 from  http://environment.about.com/od/ozonedepletion/a/whatisozone.html