In their letters, they have urged the Prime Minister to take concrete measures to curb air pollution in Delhi and Haryana.
The students also suggested several ideas to reduce pollution in their post-cards.
They suggested measures like planting more trees, banning crackers on Diwali, curbing crop-residue burning, introducing 'Odd-Even' scheme in Gurugram and promoting the use of bicycles.
"I am baffled how the people of Delhi-NCR are being made to live in a gas chamber. Urgent measures need to be taken to reduce pollution levels or else the city will keep facing problems every year," said Pearl, a Class X student.
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"My parents do not allow me to play outside due to pollution. I wear a mask, which is very cumbersome and annoying," Ashreya said.
Principal DPS-Sushant Lok Sunita Nagpal said, "According to UNICEF 6,00,000 children under five years of age die across the world due to air pollution related diseases every year."
Last week schools were shut in Gurugram due to severe air pollution.