What does it mean to warn the weather with heavy environmental pollution and start level 2 emergency?

Heavy air pollution is divided into four warning levels, as if each region is different. Generally, from light to heavy, the order is early warning level 4, early warning level 3, early warning level 2 and early warning level 1, which are marked with blue, yellow, orange and red respectively, and early warning level 1 (red) is the highest level.

Warning Level 4 (blue):

Predict serious pollution in the next day

Emergency measures: remind children, the elderly, patients with respiratory, cardiovascular and cerebrovascular diseases and other susceptible groups to reduce outdoor exercise. Advocate the public and units that emit air pollutants to consciously take measures to reduce pollutant emissions, such as increasing the frequency of sprinkling water on construction sites and cleaning roads; Sewage disposal units shall take further measures to reduce pollutant discharge.

Warning Level 3 (yellow):

Predict serious pollution in the next day or for three consecutive days

Emergency measures: In addition to health protection reminding measures and suggested pollution reduction measures, compulsory pollution reduction measures are added, such as the key roads determined according to the sub-plan of road cleaning and washing during heavy air pollution, and the frequency of road cleaning and washing is increased to reduce traffic dust pollution; Effective dust control measures such as covering and sprinkling water must be taken to reduce the excavation scale of earthwork construction and demolition of buildings.

Early warning level II (orange):

It is predicted that severe pollution or serious pollution will occur alternately in the next three days

Emergency measures: stop earthwork and building demolition at the construction site, and stop the transportation of dust-prone vehicles such as muck trucks and gravel trucks; According to the list determined by the sub-plans for stopping or limiting production of industrial enterprises during the period of heavy air pollution, the relevant enterprises shall be implemented with measures to stop production or limit production and reduce emissions by 3%; On the basis of the existing scope of "no release" and "no burning", fireworks and firecrackers and open-air barbecues are prohibited throughout the city.

It is suggested that primary and secondary schools and kindergartens should stop outdoor sports such as physical education class, recess exercises and sports meetings.

Early warning level 1 (red):

It is predicted that serious pollution will occur in the next three days

Emergency measures: On the basis of the orange early warning of "stop production, stop work, no release and no burning", motor vehicles will be driven with even and odd numbers in the whole city, among which 3% of all official vehicles in Beijing will be stopped on the basis of even and odd numbers.