The natural increase in hydrogen sulfide and volcanic ash emissions due to volcanic activity within the Kilauea caldera at times produces sufficient vog to affect breathing on the nearby island of Maui.

Similarly, a study in New Zealand concluded that environmental emissions per kg of beef produced can be reduced by incorporating feedlot finishing in a beef production system.

The emissions from the fires, much like exhausts from cars and chimneys, can produce ozone and smog even at great distances.

Vehicle emissions control is the study and practice of reducing the motor vehicle emissions - emissions produced by motor vehicles, especially internal combustion engines.

Moreover, emissions from the Oil Sands are falling per barrel produced.

He noted that emissions from coal-burning factories produce sulfuric acid, while exhaust from cars produces nitric acid.

This is because gas heaters, especially when unflued, are not suitable for bedroom use - gas heaters cannot be used in confined spaces due to the reduced oxygen, and the emissions produced.

This emission produces the blue glow.

After two supermassive black holes coalesce, emission of linear momentum can produce a "kick" with amplitude as large as 4000 km/s.

Nearby emission or removal of CO2 typically produces sharp fluctuations, in space and time, in mole fraction.