Nitrogen oxides (NOx) are invisible emissions that are a typical result of combustion. Anything that burns requires oxygen, but if there is excess oxygen, NOx forms. Because UTOC limits the incoming oxygen, the potential for NOx is small, and is typically less than 10% that from an incinerator and well below environmental emission limits.
Third-party engineering firms and the local university tested for NOx and numerous other potential emissions from the UTOC processing highly toxic railroad ties as well as meat and bone meal. Rail ties, if you don't know, are treated with
creosote which is composed of more than 300 chemicals, many of them toxic and persistent. These firms have generated hundreds of pages of reports indicating that emissions are below Canadian emission control standards without requiring emission controls you typically see on incinerators. They also show the ash is completely sterile, devoid of any organic material.
The Canadian Food Inspection Agency tested deadstock and offal to determine that UTOC successfully destroys all pathogens. I've also processed many other materials including plastic, sewage sludge and municipal solid waste without any visible emissions.