You can add a "Halted" market data column to a Watchlist or your Portfolio page in TWS or Mosaic that will populate when a security is currently not trading due to a regulatory defined trading halt or from an exchange's temporary volatility halt.
See: How do I add a column to my TWS page?
Information regarding regulatory trading halts can be found on the SEC's website. Information regarding temporary trading halts can be found on the Nasdaq website.