What are the symptoms of ammonia exposure at various concentration levels?
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A
25-50 ppm: eye/throat irritation; 100-200 ppm: severe irritation; 300+ ppm: immediately dangerous; 2500+ ppm: rapidly fatal
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B
Ammonia has no health effects below 500 ppm
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C
Only skin irritation occurs at any concentration
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D
Ammonia exposure only affects the eyes