Multiple choice

CO is a more harmful pollutant because it ______.

  1. has more affinity for haemoglobin

  2. reacts quickly with UV radiations

  3. has less affinity for Hb

  4. causes ozone depletion

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbon monoxide (CO) is highly toxic because it binds to hemoglobin with approximately 240 times greater affinity than oxygen. This forms carboxyhemoglobin, reducing the blood's oxygen-carrying capacity and causing tissue hypoxia. CO does not react quickly with UV radiation (B), nor does it cause ozone depletion (D). Option C is factually opposite to the truth.