It sounds like the limestone might be experiencing general weathering or chemical deterioration rather than just pollution-related damage, especially since it’s affecting areas above street level too. Factors like freeze-thaw cycles, acid rain, or even the original stone quality and mortar can contribute to spalling over time. A good first step would be to have a professional stone conservator or structural engineer inspect the facade to determine the exact cause. They can advise whether cleaning, repointing, or applying a protective treatment is appropriate. Avoid aggressive cleaning or sealants before understanding the issue, because that can sometimes make spalling worse.
source https://www.inspectorsjournal.com/topic/19777-worn-limestone-exterior/?do=findComment&comment=183054
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