Living in the cities has some harm. Firstly, the problem of the air. The air in the city is bad, it is negative of people's health, so this is cause of respiratory diseases. And bad affect about the environment. Secondly, traffic problems, nowaday has a lots of vehicle so it is the causes of traffic accident and traffic jams. Thirdly! At night, in the city is so noise and has a lot of light. It's from the lights and traffics so it's can make people headache and eyestrain or more. . . Next, the water pollution from the some people no sense litter in the river. It make the fish and underwater animals sick, and whose people use this water will sick and intestinal disease. . . . That is one of the negative sides when living in the city. So people should protect the enviroment, contribute to making the living space is fresh and green more. 
Living in the  
cities
 has  
some
 harm.  
Firstly
, the problem of the air. The air in the city is  
bad
, it is  
negative
 of  
people
's health,  
so
 this is cause of respiratory diseases. And  
bad
  affect
 about the environment.  
Secondly
,  
traffic
 problems,  
nowaday
 has  
a lots
 of vehicle  
so
 it is the causes of  
traffic
 accident and  
traffic
 jams.  
Thirdly
! At night, in the city is  
so
 noise and has  
a lot of
 light. It's from the lights and  
traffics
  so
 it's can  
make
  people
 headache and eyestrain or more.  
.
  .
  Next
, the water pollution from the  
some
  people
 no sense litter in the river. It  
make
 the fish and underwater animals sick, and whose  
people
  use
 this water will sick and intestinal disease.  
.
  .
  .
  That is
 one of the  
negative
 sides when living in the city.  
So
  people
 should protect the  
enviroment
, contribute to making the living space is fresh and green more.