Which of the descriptions below does not explain the effects of air pollution on the respiratory system?   It could restrict air flow through the bronchi

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Which of the descriptions below does not explain the effects of air pollution on the respiratory system?

 

1. It could restrict air flow through the bronchi.
2. It could disrupt the rate of ventilation.
3. It could prevent hemoglobin from binding to oxygen.
4. It could increase carbon dioxide uptake in alveolar sacs.