emissions

/iˈmɪʃ.ən/ (bre, ipa) · [ɪmˈɪʃənz] /iˈmɪʃ.ən/ (ame, ipa) · [ɪmˈɪʃənz] /ē-ˈmi-shən How to pronounce emission (audio)/ (ame, mw)

emissions — noun

1. the process, or repeated events, of a source letting gas, heat, light, or simila

1.名詞C1
釋義

the process, or repeated events, of a source letting gas, heat, light, or similar material or energy out

例句

The study tracks emissions during the first minute of heating.

emissions during + process

Repeated emissions from the valve showed that the seal was damaged.

repeated emissions from + source

同義詞
  • release

    everyday general word for letting something out

  • discharge

    more technical and often used for gas, liquid, or electricity

  • output

    broader and often focuses on what a machine produces rather than the release event itself

文法句型

emissions from + source

emissions during + process

repeated / brief emissions

用法筆記

This sense focuses on the release as an event or process, often in technical descriptions of when emissions begin, repeat, or stop. Distinguish from sense 2, which measures how much comes out, and sense 3, which usually refers to environmentally harmful air output.

常見錯誤

❌The lamp gave one emissions.
✅The lamp gave off several emissions during the test.
💡use the singular emission for one event; emissions usually refers to repeated or grouped release events.

2. how much heat, light, gas, or similar matter or energy a thing gives off

2.名詞C1
釋義

how much heat, light, gas, or similar matter or energy a thing gives off

例句

The machine records heat emissions from the battery every hour.

heat emissions; record emissions

The lab compared light emissions from three kinds of glass.

compare light emissions

同義詞
  • output

    general word for the quantity produced by a machine or system

  • discharge

    technical term for material or energy sent out from a source

  • radiation

    only fits when the thing given off is energy such as heat or light

文法句型

heat / light / infrared emissions

emissions from + source

record / compare emissions

用法筆記

This sense names how much material or energy is coming out from a source. It is common in measurements, comparisons, and test reports, unlike sense 1, which focuses on the release process itself.

常見錯誤

❌The battery's emissions was high.
✅The battery's emissions were high.
💡emissions is plural in form here and normally takes a plural verb.

3. harmful gases and tiny particles released into the air, especially the kind meas

3.名詞B2
釋義

harmful gases and tiny particles released into the air, especially the kind measured for climate or air-quality rules

例句

The factory cut emissions after installing newer filters.

cut emissions

New rules limit emissions from trucks entering the city center.

emissions from + source

同義詞
  • exhaust

    mainly refers to gases from an engine or pipe, so it is narrower than emissions

  • pollution

    broader word for the overall dirty condition, not just what one source sends out

  • pollutants

    focuses on the harmful substances themselves, especially as separate items to test or regulate

文法句型

emissions from + vehicle / factory

cut / lower / reduce emissions

methane / carbon emissions

用法筆記

This is the most common public-policy sense. It usually refers to gases or particles that damage air quality or add to climate change, rather than any release of light or heat. Distinguish from sense 2, which can be neutral and technical.

常見錯誤

❌The car produced much emission.
✅The car produced high emissions.
💡this environmental sense is normally used in the plural.