More on the noise issue and the RJ100. See this link and go to paragraph 3.5.4
https://www.londoncityairport.com/co...s%20LowRes.pdf
If I'm reading this correctly, it does seem to be only the RJ100 variant that is affected. It specifically says that only Swiss are still operating the RJ100. The report specifically lists the movement by type and shows all categories as separate type, ie 146/100 - 200 - 300 as three different and RJ types as three different.
There is no mention of noise breaches by the RJ85 (used by Cityjet and others) in the report. There is also a breach by the Dornier328 jet.
I am a mere observer so welcome other opinions if you think I've misinterpreted this report.