Humans can smell chlorine gas at ranges from 0.1–0.3 ppm.
According to a review from 2010:
At 1–3 ppm, there is mild mucus membrane irritation that can usually be tolerated for about an hour.
At 5–15 ppm, there is moderate mucus membrane irritation.
At 30 ppm and beyond, there is immediate chest pain, shortness of breath, and cough.
At approximately 40–60 ppm, a toxic pneumonitis and/or acute pulmonary edema can develop....
Concentrations of about 400 ppm and beyond are generally fatal over 30 minutes,
and at 1,000 ppm and above, fatality ensues within only a few minutes
According to a review from 2010:
At 1–3 ppm, there is mild mucus membrane irritation that can usually be tolerated for about an hour.
At 5–15 ppm, there is moderate mucus membrane irritation.
At 30 ppm and beyond, there is immediate chest pain, shortness of breath, and cough.
At approximately 40–60 ppm, a toxic pneumonitis and/or acute pulmonary edema can develop....
Concentrations of about 400 ppm and beyond are generally fatal over 30 minutes,
and at 1,000 ppm and above, fatality ensues within only a few minutes
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