![Advection fog envelopes Victoria Harbour in Hong Kong, Feb. 21, 2019. (Photo: China News Service/Zhang Wei)](http://www.ecns.cn/hd/2019/02/22/18ffe4695ec94f45b50f6dd78f529f71.jpg)
Advection fog envelopes Victoria Harbour in Hong Kong, Feb. 21, 2019. (Photo: China News Service/Zhang Wei)
![Advection fog envelopes Victoria Harbour in Hong Kong, Feb. 21, 2019. (Photo: China News Service/Zhang Wei)](http://www.ecns.cn/hd/2019/02/22/ea2d54d6371347d6b6d3e9803e07701c.jpg)
Advection fog envelopes Victoria Harbour in Hong Kong, Feb. 21, 2019. (Photo: China News Service/Zhang Wei)
![Advection fog envelopes Victoria Harbour in Hong Kong, Feb. 21, 2019. (Photo: China News Service/Zhang Wei)](http://www.ecns.cn/hd/2019/02/22/547f94685ff5472bae7147114bac6d03.jpg)
Advection fog envelopes Victoria Harbour in Hong Kong, Feb. 21, 2019. (Photo: China News Service/Zhang Wei)
![Advection fog envelopes Victoria Harbour in Hong Kong, Feb. 21, 2019. (Photo: China News Service/Zhang Wei)](http://www.ecns.cn/hd/2019/02/22/b79dc51c811c48258f1b7d8886363a15.jpg)
Advection fog envelopes Victoria Harbour in Hong Kong, Feb. 21, 2019. (Photo: China News Service/Zhang Wei)
![Advection fog envelopes Victoria Harbour in Hong Kong, Feb. 21, 2019. (Photo: China News Service/Zhang Wei)](http://www.ecns.cn/hd/2019/02/22/13f1478dee0448eabf010c312a7c4ef5.jpg)
Advection fog envelopes Victoria Harbour in Hong Kong, Feb. 21, 2019. (Photo: China News Service/Zhang Wei)