Set quality per build
Build profiles can override quality settings for different target devices.
Unity 6.1
Override build profile settings Update releaseSuperseded

What changed
Unity feature: Build profile quality overrides
Build profiles can override quality settings per target. A mobile or lower-spec profile can use a different quality selection without changing the project-wide defaults.
Use it
- Open File > Build Profiles and select the target profile.
- Add quality-setting overrides and choose the quality levels available to that build.
Requirements and limits
- Overrides apply in Play mode as well as the built Player when that profile is active.