1. The functional or operational level at which something operates or is maintained during normal use
The machine operates at a working level of 500 watts.
A máquina opera em um nível de trabalho de 500 watts.
2. The minimum or standard level of performance or competence required for a job or task
You need to reach a working level of proficiency in Spanish before starting the project.
Você precisa atingir um nível de trabalho de proficiência em espanhol antes de começar o projeto.
3. In radiation safety, the concentration of radon decay products in air
The working level of radon in the basement exceeded safe limits.
O nível de trabalho de radônio no porão excedeu os limites seguros.