Should office workers take a vacation in foggy days?

No, the haze weather in Xi is very frequent. Since 18, smog has been wandering in Xi 'an for a week. According to statistics, Xi 'an's air quality index has "broken the table" for nearly a week, exceeding the normal 500 index, and the air pollution index ranks among the best in cities across the country. The city wall is gone, the bell tower is gone, the Wild Goose Pagoda is gone, the TV tower is gone, and even Xi 'an is gone ... In the windless weather in Xi 'an, smog can often be seen permeating the whole ancient city, and the line of sight is blurred, which affects traffic and travel. In some smog-hit areas, traffic control measures have been implemented on many roads due to smog disasters. This foggy weather is like Silent Hill, you know.