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Across 3. something worth little or nothing 6. stop something from happening 7. to murder 9. unpleasant to experience 10. unhappy, disappointed 11. a smell, whether pleasant or unpleasant 12. a condition in humans, plants, or animals that results in pathological symptoms and is not the direct result of physical injury 13. the act of polluting something, especially the natural environment

Down 1. a failure to use something 2. dirty or unhygienic and thus likely to cause disease 4. likely to cause harm: likely to cause or result in harm or injury 5. causing damage or injury 8. pieces of trash that have been left on the ground 9. not good for the health