Depletion of ozone layer is caused by

Which of the following reacts with haemoglobin in the blood to form carboxyhaemoglobin?

The acceptable level of carbon monoxide gas $(CO)$ in the atmosphere in $ppm$ level is

Green plants use carbon dioxide during photosynthesis and release oxygen,yet carbon dioxide is considered responsible for the greenhouse effect. Why?

Ozone is a gas heavier than air. Why does it not settle around the Earth's surface?

The layer of atmosphere between $10 \, km$ to $50 \, km$ above the sea level is called as