👉 The "mm fumes" refer to a term used in the automotive and industrial sectors, particularly within the context of diesel engines, to describe the low-level emissions that are often overlooked but can still have significant environmental and health impacts. These fumes include particulate matter (PM), nitrogen oxides (NOx), and other pollutants that are emitted at concentrations too low to be detected by standard air quality monitors. Despite their low levels, these emissions can contribute to respiratory issues, cardiovascular problems, and other health concerns for nearby residents and can also affect the environment, including contributing to acid rain and smog formation. Addressing mm fumes is crucial for improving air quality and public health.