20 14 Spring Festival temperature

A, fireworks will produce harmful gases and dust, so reducing fireworks can reduce air pollution, so A is correct;

B, using natural gas instead of coal as fuel can reduce the generation of harmful gases and dust and reduce air pollution, so B is correct;

C. wearing a special PM2.5 mask can't reduce air pollution, so c is wrong;

D, driving less private cars and taking more public transport can reduce the generation of harmful gases and dust and reduce air pollution, so D is correct.

So choose: C.