Is there a way to assess noise risk without a dosimeter?

If you can’t be heard from an arm’s length away, you should be wearing an HPD.

Answer Extra: 

If you don’t have scientific tools to give you an accurate picture of your noise level risk, you can get an “unofficial,” ballpark idea as to your risk of NIHL. Just stand at arm’s length from the person you’re speaking to; if you have to raise your voice to be heard, the noise in your area is potentially at a hazardous level.

source: Annals of Occupational Hygiene, November 2008