1. substances discharged into the air, especially gases from vehicles or industrial processes
Usage: environmental science
2. the production and discharge of something, especially light, heat, or sound
Usage: physics; technical

Examples

• The factory reduced its carbon emissions by 30% last year.
• Vehicle emissions are a major cause of air pollution in cities.
• New regulations limit harmful emissions from power plants.
• The government set strict emissions standards for automobiles.
• Scientists study light emissions from distant stars.
• The device measures sound emissions from machinery.
• Solar panels convert light into electricity without producing emissions.