Correct
无污染
/ wú wūrǎn /
Strokes
Example
As an Adjective
pollution-free; free of pollution/contamination
1
Wúwūrǎn
无污染
néngyuán
能源
/
ránliào
燃料
pollution-free energy/fuel; clean energy/fuel
2
Wúwūrǎn
无污染
gōngyì
工艺
/
gōngyè
工业
pollution-free technology/industry