Which of the following is not produced by residential or commercial fires?

Nitrogen dioxide is primarily produced from combustion processes that involve large amounts of nitrogen in high-temperature environments, such as vehicle emissions and industrial processes, rather than from residential or commercial fires. In contrast, carbon monoxide, hydrogen cyanide, and phosgene are known byproducts of residential and commercial fires due to the combustion of organic materials and synthetic substances commonly found in buildings and household items.

Carbon monoxide is formed whenever there is incomplete combustion, particularly in enclosed spaces where oxygen may be limited. Hydrogen cyanide can be produced from burning nitrogen-containing materials, while phosgene, a toxic gas, can result from the combustion of chlorinated hydrocarbons present in various household products. Thus, the absence of nitrogen dioxide among the products typically generated from residential or commercial fires highlights it as the correct choice for this question.