"excess emissions" is correct and can be used in written English.
You can use it any time you are talking about emissions that are greater than desired or acceptable. Example: The factory had to be shut down due to excess emissions from the chimney.
For one thing, a jalopy's excess emissions do not pose a threat of catastrophe.
By remote, computers could scan each car for the code indicating excess emissions.
Many of the violations were excess emissions of chemicals that cause smog or acid rain, the agency said; the plants also released toxic chemicals.
On top, VW has agreed to pay an additional $4.7bn to programmes that offset excess emissions and to clean-car projects.
Firms that want to exceed their allocations must buy spare permits from cleaner rivals, or else pay for projects to offset their excess emissions in poor countries.
Owners will have two years to decide whether to sell back vehicles – and it is not clear when EPA and California will decide whether to approve fixes, which may not eliminate all excess emissions.
We compare the excess emission in both bands after subtracting their continuum levels (see Section 3).
We present monitoring of this excess emission, interpreted as arising from giant active loop structures and prominences.
This selection process left us with 18 sources that are possibly evolved AGB stars, PPNe, and PNe and have excess emission around 21 μm.
PHA is expected to solve some environmental problems such as, excess emission of carbon dioxide, depletion of petroleum and environment pollution by waste plastics.
These results are in agreement with the prediction of the temperature-fluctuating dust emission or infrared fluorescence for the excess emission.
