Precise definitions of navigable waters of the United States or navigability are ultimately dependent on judicial interpretation and cannot be made conclusively by administrative agencies.
Formaldehyde Poisoning is a disorder brought about by breathing the fumes of formaldehyde. This can occur while working directly with formaldehyde, or using equipment cleaned with formaldehyde. Major symptoms may include eye, nose, and throat irritation; headaches; and/or skin rashes.
If you can smell formaldehyde, on the other hand, you know you're poisoning yourself. The chemical, often used as a preservative, has a distinct unpleasant odor. The nausea and headache are from the toxicity, not just the scent. Paraformaldehyde, a related chemical also used as a fixative, possibly smells even worse.