Sigma0 quality flag

I am mainly using GRD product. Is there a quality flag on sigma0, which may indicate the presence of radio frequency interference, calibration error etc?

As of a year ago, the quality control group wasn’t checking for RFI. If anything has changed since then you could check here
Generally strong RFI occurs in usual places if the source is from the ground like across the Canadian Arctic Norad stations or if it’s interference from other satellites then it could happen anywhere. There isn’t anything in the metadata of the product indicating this.

Thanks! The www link defines a period where anomalies occurred. It appears that there is no quality flag assigned to each pixel or granule - is this correct?