Indoor smoke from household use of solid fuels.

家庭使用固体燃料产生的室内烟雾。

youdao

Fruit orchard ists have used various solid fuels.

果园的经营者曾使用过各种固体燃料。

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These solid fuels may be the least costly fuels available.

这些固体燃料可能是成本最低的燃料。

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He notes a World Health Organization estimate that more than one and a half million people a year die from breathing smoke from solid fuels.

VOA: special.2010.02.01

These solid fuels may be the least costly fuels available.

VOA: special.2010.02.01

Sun exposure and indoor pollution from burning solid fuels are also risk factors.

BBC: Latin America 'threatened by rising cancer cases'

Do they displace solid fuels and reduce indoor air pollution?

FORBES: Where There's Smoke, There's Fire: A Call to Action for Better Indoor Air Pollution Research