smokeless

Everyday

1. Giving off little or no smoke when burned: smokeless fuel. tree →
2. Without smoke: a smokeless sky. tree →
3. (law, UK) A «smokeless zone» is an area where only fuels that make little smoke may be burned. tree →

In the lessons

Science and history: after the deadly London smog of 1952, Britain passed the Clean Air Act and made smokeless zones, so people burned smokeless coal. Everyday: «smokeless» fuels and stoves are better for the air. In the old days of steam, «smokeless» meant a very clean fire.

Examples

• Our town is a smokeless zone. tree →
• Dad bought smokeless fuel for the stove. tree →
• Smokeless coal helped clean the air in cities. tree →
• The sky above the factory was smokeless at last. tree →
• Modern stoves are almost smokeless. tree →
• The cosy room had a bright, smokeless fire. tree →

Note

Suffix -less means «without»: smokeless = without smoke. «Smokeless tobacco» is chewed tobacco — it is still harmful.