Which occupational history best supports chronic inhalation of irritants as a cause of respiratory distress?

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Chronic inhalation of irritants in the workplace causes long-term lung inflammation and scarring, leading to progressive respiratory distress. Mining work involves prolonged exposure to mineral dust such as coal and silica, which over years can cause pneumoconiosis and related lung impairment. This pattern of gradual, persistent lung damage fits the scenario best because the symptoms develop and worsen with ongoing exposure, not abruptly or due to non-occupational triggers.

The other options point to incidents or conditions that are either acute or non-occupational: recent travel may involve infections or other factors not tied to long-term inhalant exposure; an acute asthma attack is a sudden bronchoconstriction episode; an allergic reaction to pollen is an IgE-mediated, typically seasonal response.