The candidate cities are Qatar's capital Doha, Catalan capital Barcelona and the city in the Pacific Northwest in the state of Oregon Eugene, which many refers to as Track Town USA.
There are several factors that IAAF will look at before deciding which city will have the opportunity to host world's one of the biggest sporting event the 2019 IAAF Athletics Word Championships.
The 2015 IAAF World track and field championships will be hosted in Beijing, while the 2017 world championships will be hosted in London.
The announcement of the 2019 host city will be stream lived on youtube by the IAAFMagazine. https://www.youtube.com/watch?v=GRFa-F1NrE4