I'm editing my night shots in Lightroom and use Google Nik Collection Dfine2 to reduce the noise.. Noise reducing in Dfine is the last item in my workflow, and when I export image .jpg it has poor quality, I tried exporting without noise reduction (Dfine2) and quality is better.. So what is the problem? Can I somehow export with high quality Noise Reduced image? 

Answer
That looks more like color banding due to lower bit-depth and jpeg compression than noise. Such banding often looks very similar to chrominance noise.
Increase the JPEG quality when you export so that it isn't as heavily compressed and the issue should be minimized.
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