polluted - clean
stressful - relaxing
boring - interesting
cheap - expensive
unfriendly - friendly
crowded - quiet
noisy - quiet
safe - dangerous
The city is more polluted than country.
Life in the city is more stressful than life in the country.
The city is more interesting than country.
The shops in country are cheaper than the shops in the city.
People in the country are more friendly than people in the city.
The city is more crowded than country.
The country is safer than the city.
Proszę . ;)
Pozdrawiam . ;)