a high-quality coal with a high carbon content and a metallic luster that produces very little smoke when burned

A type of propellant that produces very little smoke when burned, typically made from nitrocellulose; commonly used in military ammunition

no-smoking area; smoke-free zone

Service industries that do not produce smoke or pollution, especially the tourist trade.

smokeless coal; anthracite coal with a high carbon content that burns with little smoke

Industries that provide services without causing heavy smoke or air pollution, most commonly referring to tourism.