Traffic policeman in Tokyo

Wears gas mask

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Requires daily oxygen treatment

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Suffers from black lung disease

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All the above

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Solution

The correct option is B Requires daily oxygen treatment
In Tokyo, the excessive accumulation of the air pollutants in the atmosphere have severely deteriorated the oxygen availability because the primary pollutants like nitrogen oxides, sulphur oxides, hydrocarbon react with oxygen to form the ozone, PAN etc. So, the people working in fields like traffic policemen suffer from severe deoxygenation. So, they need hyperbaric oxygen treatment daily.
Hence, the correct answer is 'Requires daily oxygen treatment'.

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