What are the things which may cause pollution at school?

Lunch Box ==> Land Pollution, Air pollution (disposal)
Noise ==> Noise pollution
Photocopy Papers ==> Land Pollution
Plastic Bag (Fishball) ==> Land Pollution, Air pollution (disposal)
Plastic Bottles, Cans ==> Land Pollution, Air pollution (disposal)

Plastic water bottle, Lunch box.. for take away..