noun
emissions quantity; amount discharged
Used in environmental, industrial, and technical contexts for the amount of substances (e.g., CO₂, pollutants) released.
この工場の二酸化炭素排出量は年々減少している。
This factory's carbon dioxide emissions have been decreasing year by year.
各国が温室効果ガスの排出量削減目標を発表した。
Each country announced targets for reducing greenhouse gas emissions.
排気量 specifically refers to engine displacement or exhaust volume, while 排出量 is broader for any emitted substance.
Compound of 排出 (emission, discharge) and 量 (quantity, amount).