Zài bàngōngshì dāi le yī tiān, chūlái tòutòu qì ba.
After being in the office all day, let's go out and get some air.
Tips
usage
透透气 (with the verb reduplicated) is the casual way to say 'get a breath of fresh air' — it implies a brief, relaxing break. 透气 as an adjective describes materials that allow air to pass through (breathable fabrics, shoes, etc.).