New York - Oct 6, 2008 - Arbitron has commercialized its Portable People Meter radio ratings services in eight new markets. Arbitron has released radio audience estimates for the September 2008 PPM survey month (Aug. 21 - Sept. 17) to its subscribers in New York, Los Angeles, Chicago, San Francisco, Nassau-Suffolk, Middlesex-Somerset-Union, Riverside-San Bernardino and San Jose.

Effective today, the PPM radio audience estimates for these markets should be used as the basis for transactions of radio commercial time among subscribing stations, agencies and advertisers. In addition, the July and August PPM survey months, which Arbitron had previously released as pre-currency information, are now designated as currency data. The Spring 2008 diary-based radio audience report (April 3-June 25) is no longer deemed currency for buy/sell transactions.