What do blue alert and orange alert mean?

Blue is the lowest level warning, and red is the highest level warning. The China Meteorological Administration announced the "Trial Measures for the Issuance of Early Warning Signals for Sudden Meteorological Disasters." The measures stipulate that whenever typhoons, heavy rains, high temperatures and other sudden disastrous weather approaches, the public can see new warning signals from television, radio, the Internet, mobile phone text messages and electronic display boards located in prominent locations in the city.

The orange warning signal is a type of meteorological disaster warning signal. The meaning of the orange warning signal: It may be affected by a tropical cyclone within 12 hours, with average winds reaching level 10 or above, or gusts above level 11; or it has been affected by a tropical cyclone, with average winds of level 10-11, or gusts of level 11-12. May last.

Extended information

Heavy air pollution warning level

1. Yellow warning: It is predicted that the daily average air quality index in the city >200 will last for 2 days (48 hours) and above, and severe pollution occurs in a short period of time, and high-level warning conditions are not reached.

2. Orange warning: It is predicted that the daily average value of the city's air quality index will be >200 for 3 days (72 hours) or more, and the high-level warning conditions are not reached.

3. Red warning: It is predicted that the daily average value of the city's air quality index will be >200 for 4 days (96 hours) or more, and it is predicted that the daily average value >300 will last for 2 days (48 hours) or more; Or when the daily average air quality index in the city is predicted to reach 500.

Baidu Encyclopedia - Blue Alert

Baidu Encyclopedia - Orange Alert