If a large amount of waste in the school will cause air pollution, which makes the school is not good because if there is so much trash, foul odors and germs that cause the disease within the school.
Waste within school if the amount that would cause pollution, which will make the air in the school ไม่ดีเพราะ if there's rubbish is to smell the stink and various germs that make people inside the school disease