Lántiān bǎowèi zhàn shì Zhōngguó de huánbǎo zhèngcè.
The 'Blue Sky Defense Campaign' is China's environmental policy.
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蓝天 has become politically significant in China due to air pollution. 蓝天保卫战 (Blue Sky Defense Campaign) is a government initiative to combat smog. Seeing blue sky in Beijing is celebrated on social media.
