A(n) exposure is a repeated or prolonged exposure (over months or years) that may bring about slowly developing symptoms. these exposures do not cause immediate, obvious harm and a person may not see, feel, or smell the danger. effects, however, may be permanent

Chronic

Explanation:

Chronic effects are those resulting from chronic exposure, ie exposure to small doses over several months or years. In other words, chronic exposure occurs when an individual is exposed to some harmful substance over a long period of time.

These exposures result in damage that takes time to occur and shows no obvious symptoms. Chronic exposure is quite dangerous because it is hard to see the incidence and effects.