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1. The destroyers Stethem, Spruance and Momsen have been patrolling near Chinese features in the Spratlys archipelago and the Scarborough Shoal, which is near the Philippines, the officials said.

2. ships in the South China Sea but it is not yet known if the presence of the destroyers attracted particular attention.

3. Vietnamese women in air pollution protective masks.

4. People used to think it was a romantic sight, seeing the buildings in the outcrops sticking out like needles from a layer of dark air until they discovered that it wasn't fog.

5. On September 26, Ho Chi Minh City's Air Quality index (AQI) became the most polluted city in the world, and Hanoi in third place.

6.   With residents of both major cities in the country realizing that the air they breathe in is unhealthy, and that they are helpless in changing it, they are devising ways to coexist with it.

7. The air purifier market in Hanoi and Ho Chi Minh City is heating up recently.

8. Many electrical appliance sellers who don't want to miss the current trend are advertising these devices with false and unrealistic claims that they kill bacteria, viruses, mold spores in air, restore balanced humidity levels, etc.

9. Sales of air purifiers at some stores in Ho Chi Minh City jumped 200% last month.

10. 6), air purifiers are becoming indispensable items in modern households, especially in two big cities.