What is one method of mitigating the risk of dust as a source of combustion?

Good housekeeping is an effective method of mitigating the risk of dust as a source of combustion because it involves regular cleaning and maintenance practices that reduce the accumulation of dust in the workspace. Dust, especially from combustible materials, can create a significant fire hazard if allowed to build up. By keeping areas clean and free from dust, the potential for ignition and combustion is minimized. This includes practices such as regular sweeping, vacuuming, and ensuring that spills are promptly cleaned, which collectively help in controlling dust levels and consequently reduce fire risk.

The other methods suggested do not address the dust issue effectively. Increasing air temperature could potentially worsen combustion risks by providing a more conducive environment for ignition. Reducing pressure may not be relevant to dust management and could complicate other process safety concerns. Complicated machinery may introduce more hazards rather than mitigating dust-related risks, as complex systems can lead to more failures or dust being generated through inadequate maintenance. Therefore, maintaining good housekeeping is the most direct and effective approach to mitigate the risks associated with combustible dust.