Define those:

Heat capacity
microclimate

Heat capacity or thermal capacity is a physical property of matter, defined as the amount of heat to be supplied to a given mass of a material to produce a unit change in its temperature

microclimate is a local set of atmospheric conditions that differ from those in the surrounding areas, often with a slight difference but sometimes with a substantial one. The term may refer to areas as small as a few square meters or square feet or as large as many square kilometers or square miles.

Heat Capacity:

"The number of heat units needed to raise the temperature of a body by one degree."

Microclimate:

"The climate of a very small or restricted area, especially when this differs from the climate of the surrounding area."

the red coloration of the lungs looks alarming and adds to the overall message that the flu is threatening apex

you didn't provide the passage.

explanation:

seeing as this is your first question on i can see why you may have not known that you need to provide the passage.

without the passage, or even the name of the passage, we can not read the passage, therefore we can not determine when or how the pacing effects the tone.

however, you can either repost this question (providing the passage this time)

or you can comment below what the passage is, and i'll you to the best of my ability!