Prepare for your CIH exam by completing high-quality practice questions with solutions and tutorial support. These questions come from all the domains required to past the exam. The questions are designed to be both formative and summative. You can use them for both. Use them to learn and review critical industrial hygiene principles or to test your readiness for the CIH exam. Toxicology and ventilation are often described as one of the most important domains in this exam. Many questions on these domains are included in this practice test pack. Practice tests are broken up into three sections to facilitate both summative and formative assessments. Tutorial support available for difficult questions.