| high ozone | 1.12 | In Houston, high ozone levels last generally through November. | ||
| antarctic ozone | 0.72 | Greenbelt, Md. -- NASA discusses new evidence that man-made chlorine in stratosphere is cause of Antarctic ozone hole. | ||
| low-level ozone | 0.66 | Low-level ozone is produced by the effects of sunlight on car fumes. | ||
| federal ozone | 0.59 | Austin is not affected because it complies with federal ozone limits. | ||
| stratospheric ozone | 0.59 | ...stratospheric ozone. | ||
| low ozone | 0.46 | The period of extremely low ozone levels was expected to pass later this month. | ||
| worst ozone | 0.39 | Atlanta has the worst ozone problem in the Southeast. | ||
| arctic ozone | 0.26 | Bad winters suggest Arctic ozone may recover slowly. | ||
| highest ozone | 0.26 | Thanks to wind drift, the highest ozone levels are often found in country areas. | ||
| protective ozone | 0.26 | Vegetation indirectly created the protective ozone shield by pumping oxygen into the atmosphere. |