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.

• 🇷🇺Типичный или фоновый уровень чего-либо (например, шума, радиации или концентрации химических веществ), который естественным образом присутствует в окружающей среде без дополнительных или искусственных источников.

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.

   🇷🇺Фоновый уровень

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.

   🇷🇺Фоновый уровень