11.   They also said the ammonia plant did not pose a major hazard.

12.   They are not expected to become a major hazard for the boaters.

13.   Wind shear -- sudden, dangerous shifts in wind speed and direction -- is considered a major hazard to aircraft taking off or landing.

14.   Wind shears -- sudden, dangerous shifts in wind speed and direction -- are considered major hazards to aircraft as they land or take off.

15.   Yevgeny Stomatyuk, chairman of the regional environmental committee, has repeatedly warned that the tankers pose a major hazard unless the waste can be treated soon.