the big cities have many problems for human' health.

I believe that the big cities have many problems for human' health. From my perspective, I totally agree with this idea for some reasons. On the one hand, there are more environment problems in developed cities as the air pollution, water pollution, etc. People living these cities are in danger of having the highest lung cancer or malaria. For instance, my neighbor went out and didn't wear the mask, and he frequently out every day so he was diagnosed with lung cancer due to the fumes of the transport and industries. On the other hand, the children doesn't have many playground so they always suft the Internet make the eyes damaged. Although big cities have many big houses but the playground in many provinces as many as the cities. For example, I have a young brother, he often watched TV and me that the personal vehicles drove the streets made me could not play football with others so I would watch the TV shows. Consequently, if the big cities are built the more playground I think the children will seldom use the phone or play game. in conclusion, the big cities damaged our life. I believe that it should be prohibited the personal vehicles to project the health and environment.