

Какой здесь чистый воздух!
The air here is so clean!
В лесу воздух свежий.
The air in the forest is fresh.
В городе воздух не очень чистый.
The air in the city isn't very clean.
"воздух" is in the lesson "Nature" (Level 38), along with 11 other useful words. LinDuo has 180 topic lessons like this one, 2,380 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.