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Quick Answer. A personâs normal ammonia level typically ranges between 15 to 45 micrograms per deciliter. To determine these levels, an ammonia blood test is performed.
Ammonia is toxic to aquatic life and toxicity is affected by pond pH. Ammonia-nitrogen (NH 3-N) has a more toxic form at high pH and a less toxic form at low pH, un-ionized ammonia (NH 3) and ionized ammonia (NH 4 +), respectively. In addition, ammonia toxicity increases as temperature rises.