Using genitive is possible with:
can words such as "the city" or "the country" be cosidered as geographic expressions?
So,do I have I to say:
The city's crime rate OR the crime rate of the city?
The country's clean air OR the clean air of the country?
and what about consider these words as adjectives?
"the city crime rate AND the country clean air"
(Not a teacher)
Yes, you can use the genitive apostrophe with both 'city' and 'country'.
As for the adjectives, 'city' can't be used as an adjective. Perhaps 'city-like', but it doesn't fit with 'crime rate', really. 'Country' can't be an adjective in the sense of 'a country' - USA, Iran, Russia, Japan etc. 'Country' as an adjective refers to 'rural'. This would fit with 'clean air', but remember it's referring to rural land, not a country.