> ## Content Index
> Fetch the complete content index at: https://www.medianexis.com/llms.txt
> Use this file to discover other available public pages before exploring further.

# MRC strips Nielsen PPM accreditation in 4 markets, denies it in 18 more
- URL: https://www.medianexis.com/mrc-strips-nielsen-ppm-accreditation-in-4-markets-denies-it-in-18-more/
- Published: 2026-10-18T17:49:37.000Z
- Updated: 2026-10-18T17:49:38.000Z
- Description: MediaPost’s Joe Mandese reports that the Media Rating Council has revoked Nielsen’s PPM accreditation in Baltimore, Jacksonville, Philadelphia and Pittsburgh, and denied accreditation for 18 other markets under review, including New York, Boston and Washington DC.
- Author: The Signals Desk
- Tags: Measurement, Joe Mandese, MRC revokes Nielsen PPM market accreditations

**Why it matters.** Radio stations and buyers in 22 markets now lack independently vetted audience data from Nielsen, weakening its currency status just as the industry challenges its pay-to-report model.

*Signal from* [*mediapost.com*](https://mediapost.com/?ref=medianexis.com) *·* [*Joe Mandese*](https://www.medianexis.com/tag/by-joe-mandese/) *·* [*read the original*](https://www.mediapost.com/publications/article/418816/mrc-revokes-denies-nearly-two-dozen-nielsen-ppm-m.html?ref=medianexis.com)*.*