Questions & Answers about В метро шумнее, чем в библиотеке.
Russian normally omits the verb to be in the present tense.
So:
- В метро шумнее literally means In the metro, [it is] noisier
- чем в библиотеке = than in the library
A more literal breakdown is:
- В метро = in the metro
- шумнее = noisier
- чем = than
- в библиотеке = in the library
English needs is, but Russian does not here.
Шумнее is the comparative form meaning noisier.
It comes from шумно (noisily / it is noisy) or is closely related to шумный (noisy). In this sentence, it functions like it is noisier rather than directly describing a noun.
So:
- шумно = noisy / it is noisy
- шумнее = noisier / it is noisier
This sentence is really about the noise level in a place, not about a specific object being noisy.