It depends upon what kind of charts you want. If they are more or less stock charts you have host of libraries. If you are ready to pay for them,
you have github.com/pablojim/highcharts-ng one of the most robust charting platform
Or else for free you can prototype your way with c3js. It gives a pretty smooth integration with angular. We have done the same here at my organisation.
If you are looking at more of visualisations , then d3js is the beast that you would go for. Although it doesn't play easy with angular, requires a bit more skill to integrate.
I hope this helps you in some way.