soft coal

Examples (10)

• Many old factories burned soft coal, which produced thick, black smoke.
• Soft coal is cheaper than hard coal, but it's also dirtier.
• The geology lecture explained that soft coal, or bituminous coal, has a high sulfur content.
• In the 19th century, homes were often heated with fires burning soft coal.
• New regulations strictly limit the industrial use of high-sulfur soft coal.
• Is soft coal still a major energy source in this country?
• The power plant is phasing out the use of soft coal to reduce emissions.
• You can identify soft coal by its dull, layered appearance.
• Converting soft coal into coke is a key process for steel manufacturing.
• The city's air quality improved after banning the domestic use of soft coal.