The COVID-19 outbreak has many office buildings sitting idly, without employees streaming in every morning and out every afternoon. While lockdowns briefly decreased global carbon emissions about 17 percent, this was mostly due to transportation, flights and commuting grinding to halt. But 36 percent of fossil-fuel carbon emissions come from buildings, and even though most are unoccupied, the lights are still on and the heating or air conditioning is still running.
A combustible dust is any fine material that can catch fire and explode when mixed with air. Surprisingly, many organic materials such as flour, sugar, wood dust, grains, starch, potatoes, and even rice are combustible under the right conditions. Additionally, metals, plastics, chemicals, rubber, pharmaceuticals, and textile dusts are also commonly combustible. These products or materials may be stored in silos or containers, may gather in buildings at the eves, rafters, on the roofs, and various other places.