If a noise level doesn’t hurt my ears, or if I don’t hear ringing afterwards, was it dangerously loud?

Hearing loss typically occurs at repeated, unprotected exposures above 90 dB (about as loud as a handsaw or a forklift), but most people don’t feel pain in their ears until noise levels reach 120 dB—the noise level of a jet engine.

Answer Extra: 

After hearing loss, the most common indication of noise damage is ringing in the ears (called “tinnitus”). If you experience this regularly after work or leisure activities, you should look into HPD, ASAP.

source: 
source: Howard Leight Noise Thermometer