21. For another, the health effects of ozone have been observed at very low exposure levels . 22. However, close proximity to bare skin can result in exposure levels similar to direct sunlight. 23. The rate of workers becoming sensitized to beryllium varies based on genetics and exposure levels . 24. A problem that plagued the group was how to deal with questions of exposure level . 25. In each case, the actual exposure level is still determined by the camera's exposure meter. 26. Walter posits the entity needs radiation, and chooses its victims based on their exposure levels . 27. Workers in production facilities without adequate dust controls also have high exposure levels , it added. 28. Nationwide, the industry is coming under pressure as state and federal regulators reconsider acceptable exposure levels . 29. The highest dose exceeded exposure levels below high voltage power lines by a factor of 100, 30. But some children appear to have received 100 rads, and all the exposure levels are uncertain.