background level

The typical or ambient level of something (such as noise, radiation, or chemical concentration) that is naturally present in an environment, without any additional or artificial sources.

• 🇵🇹Nível típico ou de fundo de algo (como ruído, radiação ou concentração de substâncias químicas) que está naturalmente presente no ambiente, sem fontes adicionais ou artificiais.

1. Ambient measurement C1 formal

   The normal or typical amount of a substance, radiation, or noise present in an environment without any specific source.

   • The background level of radiation in this area is safe.
   • Scientists measured the background level of carbon dioxide in the atmosphere.
   • The background level of noise in the city is higher than in the countryside.

   🇵🇹Nível de fundo

2. Baseline for comparison C1 formal

   A standard or reference point used to compare changes or effects in an experiment or observation.

   • We need to establish a background level before starting the experiment.
   • The background level of pollutants was recorded before the factory opened.
   • Any increase above the background level indicates contamination.

   🇵🇹Nível de fundo