The high volume of traffic is the result of increasing/increased populations

[Rachel Adams]

Can I use "populations" in my sentence and is "increased" better than "increasing"? I am talking about different people who come from different countries.

"The high volume of traffic is the result of increasing/increased populations in big cities."

 

[Yankee]

Can I use "populations" in my sentence and is "increased" better than "increasing"? I am talking about different people who come from different countries.
population big cities."

My shot.
"The high volume of traffic is the result of increasing (the volume continues) /increased population.(as of some measured point).