Antarctic Ozone Hole Widens . ... The seasonal recur rence of the ozone hole was expected, although the size of the hole has never been so large this early in the season. ... The ozone hole's large size is probably related to unusually low temperatures, allowing CFC byproducts like chlorine to react with atmospheric ozone molecules with greater efficiency. In the above false-color picture taken earlier this month, low ozone levels are shown in red and grey. ... NASA Official: Jay Norris. ...