
1) Air pollutants 2) Discharged things 3) Epa concern 4) Exhaust output 5) Exhaust pipe discharges 6) Radioactivity, essentially 7) They affect air quality
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https://www.crosswordclues.com/clue/emissions

1) Fumes
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https://www.crosswordclues.com/clue/emissions

substances such as gases or particles discharged into the atmosphere as a result of natural processes of human activities, including those from chimneys, elevated point sources, and tailpipes of motor vehicles.
Found on
http://en.wikipedia.org/wiki/Glossary_of_environmental_science

gases, solids and liquids discharged into the air, water or ground.
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http://www.encyclo.co.uk/local/20571

The release of greenhouse gases and/or their precursors into the atmosphere over a specified area and period of time.
Found on
http://www.encyclo.co.uk/local/21291

are the discharges of pollutants into the atmosphere from stationary sources such as smokestacks, other vents, surface areas of commercial or industrial facilities, and mobile sources such as motor vehicles, locomotives and aircraft. With respect to climate change, emissions refer to the release of greenhouse gases into the atmosphere over a specif...
Found on
http://www.encyclo.co.uk/local/21348
Found on
http://www.encyclo.co.uk/visitor-contributions.php

is the release of a substance into the atmosphere
Found on
http://www.epaw.co.uk/EPT/glossary.html

byproducts of a running engine, including: exhaust pollutants, noise emissions.
Found on
http://www.horizonsunlimited.com/gear-up/motorcycle-terms-and-glossary

substances such as gases or particles discharged into the atmosphere as a result of natural processes of human activities, including those from chimneys, elevated point sources, and tailpipes of motor vehicles.
Found on
http://www.translationdirectory.com/glossaries/glossary306.php

A substance released into the air especially by some sort of motor or engine
Found on
https://sciencetrek.org/sciencetrek/topics/green_energy/glossary.cfm

Materials (gases, particles, vapors, chemical compounds, etc.) that come out of smokestacks, chimneys, and tailpipes.
Found on
https://www.encyclo.co.uk/local/20128

Substances released into the environment.
Found on
https://www.encyclo.co.uk/local/22829

Substances that are discharged into the air from industrial processes, vehicles, and living organisms. In the context of global climate change, they consist of important greenhouse gases (e.g., the release of carbon dioxide during fuel combustion).
Found on
https://www.encyclo.co.uk/local/22831
No exact match found.