The stratosphere contains a special gas called ozone ,which is found in a layers called ozone layer.This layer blocks out most of the dangerous rays from our sun .These dangerous rays cause sunburn, which can lead to skin cancer
Damaging the ozone layer allows dangerous ultra violet radiation to reach the earth. This can damage crops as well as human health.
See "How does ozone affect human health?"
Ozone is found in all layers of the atmosphere. It is a minimum value at the extremes of the exosphere, and the bottom of the troposphere (where it is called a pollutant), with a peak value in the lower stratosphere. Ozone concentrations in excess of 0.05ppm in the lower troposphere is dangerous to people with asthma, and much above this, damages plants as well.
The depletion of ozone is in variance with human health. More UV's more deterioration.
See "Does the hole in the ozone layer effect human health?"
I am not sure the question you are to ask, but there are many things that are hazardous and dangerous to human health.
The depletion of ozone layer causes:skin cancerSuppression of immune systemEye cataract.
The consequences to human health are many. Altering a DNA goes as fatal as it sounds.
The ozone produced during baking bread is typically in very low concentrations and is not emitted in harmful amounts. Ozone can be harmful at high concentrations, such as in air pollution, but in the case of baking bread, the levels are too low to pose a risk to human health.
Carbon-14 is not considered dangerous to human health in typical exposure levels. It is a naturally occurring radioactive isotope found in small amounts in the environment and in our bodies. The low energy of its radiation makes it unlikely to cause harm.
Ozone hole over Northern Stratosphere is dangerous. It is because it is present over human race.