Asthma may be attributed to

Air pollution can result in emphysema,which is:

Which of the following statements is correct regarding human respiration?

Assertion $(A):$ $A$ person goes to high altitude and experiences 'altitude sickness' with symptoms like breathing difficulty and heart palpitations.
Reason $(R):$ Due to low atmospheric pressure at high altitude,the body does not get sufficient oxygen.
In the light of the above statements,choose the correct answer from the options given below.

How does our body adapt to altitude sickness?

Which of the following respiratory disorders is commonly observed in workers employed in industries involving grinding or stone-breaking?