Many countries in the world are currently experiencing growing populations in urban areas. In recent years, big cities are facing overpopulation which led to bad implications for citizens. It is most commonly seen in cities and other urban developments. Pollution, welfare and job competition are consequences of populi explosion.
Firstly, overcrowding bring about bad affects for environments in big cities. Acrossding to Ha Noi’s traffic police official, the capital had over 7. 6 million transports in 2020, most of which are motorbikes. This is main cause of noise pollution. For example, in peak hour (rush hour), means of transports often honking loudly, especially while waiting for a red light that make people feel uncomfortable. Moreover, construction sites are also make more dust and loud sound. On other hand, traffic congestion not only limits the convenience of people travelling but also polutes the air severely. In addition, the air pollution situation is became serious by the factories and industrial zones.
Secondly, welfare system is not ensure due to overload people. Medical is one of aspects that is seriously affected. For instance, all hospitals are unable meet the number of patients who come for examination and treatment due to numerousness. In the fourth wave of Covid-19, although many field hospitals (bệnh viện dã chiến) was built for infected people in cities, it is not enough. Likewise, The crow of students also causes lack of class and affects the quality of education. Example, there are about 35 to 50 students in a class in Vietnamese’s public schools but only one teacher takes care and teaches during the lesson. Therefore, the teachers have no more time to care for each student.
Finally, the job competition rate is increase highly on the ground that the number of laborers is over gathering in cities. In the fact, the number of companies are small meanwhile labor sources are abundant gave rise to competition. For example, after graduated from universities, a lot of people had to works such as construction workers, taxi drivers, clean staff so on.
In conclusion, these three multi-effects unambiguously explain, crowding in urbans brings a lot of problems to human beings. It can cause environmental pollution, impact on welfare or career competition. I hope people should not crowd into cities blindly to minimize the negative impacts on social. 
 Many
 countries in the world are  
currently
 experiencing growing populations in urban areas. In recent years,  
big
  cities
 are facing overpopulation which led to  
bad
 implications for citizens. It is most  
commonly
  seen
 in  
cities
 and other urban developments.  
Pollution
, welfare and job  
competition
 are consequences of  
populi
 explosion. 
Firstly
, overcrowding bring about  
bad
 affects for environments in  
big
  cities
.  
Acrossding
 to Ha  
Noi
’s traffic police official, the capital had over 7. 6 million transports in 2020, most of which are motorbikes. This is main cause of noise  
pollution
.  
For example
, in peak hour (rush hour), means of transports  
often
 honking  
loudly
,  
especially
 while waiting for a red light that  
make
  people
 feel uncomfortable.  
Moreover
, construction sites are  
also
  make
 more dust and loud sound. On other hand, traffic congestion not  
only
 limits the convenience of  
people
 travelling  
but
  also
  polutes
 the air  
severely
.  
In addition
, the air  
pollution
 situation is  
became
 serious by the factories and industrial zones. 
Secondly
, welfare system is not  
ensure
 due to overload  
people
. Medical is one of aspects  
that is
  seriously
  affected
.  
For instance
, all hospitals are unable  
meet
 the number of patients who  
come
 for examination and treatment due to  
numerousness
. In the fourth wave of Covid-19, although  
many
 field hospitals ( 
bệnh
  viện
  dã
  chiến
)  
was built
 for infected  
people
 in  
cities
, it is not  
enough
.  
Likewise
, The crow of students  
also
 causes lack of  
class
 and affects the quality of education. Example, there are about 35 to 50 students in a  
class
 in Vietnamese’s public schools  
but
  only
 one teacher takes care and teaches during the lesson.  
Therefore
, the teachers have no more time to care for each student. 
Finally
, the job  
competition
 rate is increase  
highly
 on the ground that the number of laborers is over gathering in  
cities
. In the fact, the number of  
companies
 are  
small
 meanwhile labor sources are abundant gave rise to  
competition
.  
For example
, after graduated from universities,  
a lot of
  people
 had to works such as construction workers, taxi drivers, clean staff  
so
 on. 
In conclusion
, these three multi-effects  
unambiguously
  explain
, crowding in  
urbans
 brings  
a lot of
 problems to human beings. It can cause environmental  
pollution
, impact on welfare or career  
competition
. I hope  
people
 should not crowd into  
cities
  blindly
 to minimize the  
negative
 impacts on social.