Exhaust fumes. If you breathe in too much of it, your eyes will hurt, you'll feel like throwing up, and you won't be able to stop coughing.
It's called exhaust fumes. If you inhale a lot of it your eyes will be irritated, you'll feel nauseous, you'll cough continually, and you might even get cancer. So please don't inhale it!
回答１はもうちょっと小さい子供がわかるような言葉を使いました。回答2でもうちょっと難しい言葉を使いました。
排気ガス＝ exhaust fumes
吸う＝ breathe in, inhale
目が痛い＝ eyes hurt, eyes are irritated
吐き気＝ feel like throwing up, be nauseous
咳が止まらなくなる＝ won’t be able to stop coughing, cough continually
癌になるかもしれない＝ you might get cancer
アメリカ合衆国 
