Is a 5,000 ppm concentration of ammonia considered deadly?

A concentration of 5,000 parts per million (ppm) of ammonia is indeed considered extremely hazardous and can be deadly. At such high levels, exposure can lead to severe health effects, including respiratory distress, damage to lung tissues, and potential asphyxiation.

Ammonia is a highly irritating gas, and exposure even to much lower concentrations can cause irritation of the eyes, skin, and respiratory tract. However, at 5,000 ppm, the risk of acute toxicity increases dramatically. This level of exposure is well above occupational safety limits and can overwhelm the body's ability to cope with the inhalation of such a toxic substance.

While exposure time can indeed influence the effects of ammonia, the danger presented by a 5,000 ppm concentration is so high that it poses an immediate threat to life, independent of the duration of exposure. Therefore, the assertion that such a concentration is deadly is accurate.