Anti-Pollution Mask

Solution To Eradicate Pollution 4 friends were going to office by walking on Monday. Suddenly, they experienced the pollution coming out from the cars & they started coughing... One of the friends took out the pollution mask from his bag. He immediately wore the mask and walked without facing pollution. Next day. one more friend walked by wearing pollution mask after seeing the level of pollution. On Wednesday. rest of the two learnt the same from both and wore pollution masks while walking.