1.   Farman said the extremely low ozone readings probably did little harm to human health, coming in the middle of winter when people are outside less.

2.   Lung association officials said new studies indicate that even low ozone levels may be hazardous, especially to children, senior citizens and people with lung disease.

3.   Most Arctic winters in the last decade brought unusually low ozone coincident with an unusually cold stratosphere, according to the World Meteorological Organization.

4.   Those without ozone filters are intended to be flown in regions with low ozone, such as low altitudes and southerly climates.

5.   Peterson said smaller spots of low ozone could affect Argentina and even the tip of South Africa, Australia or New Zealand.

6.   But as it breaks apart, fingers of low ozone, or filaments as we call them, will go over major land mass areas.

7.   The period of extremely low ozone levels was expected to pass later this month.