The extensive symptoms，that the bad air brings for our health，are headache，running nose or stuffy nose，and cough．It is most frequently that the sensitive reaction would be noticed：you may feel dazed，queasy，sleepy，and your eyes，nose，and throat dry．If you work in the environment with bad air，you will place heavier burden on the immune system，and then you will feel weak and your work efficiency will be lowered.