Boai County Meteorological Station on January 27, 2022 9:38 issued a yellow warning signal for fog: it is expected that boai County in the next 12 hours will have a visibility of less than 500 meters of fog, or has visibility of 200-500 meters of fog and will continue, may or has caused a greater impact on traffic.(Information source: National Early Warning Issuing Center) Defense Guide 1. Relevant departments and units shall make fog-proof preparations according to their duties;2. Airports, expressways, ferry terminals and other units should strengthen traffic management to ensure safety;3. Drivers should pay attention to the change of fog and drive carefully;4. Pay attention to safety in outdoor activities.