Is the orange warning of smog a green shutdown?

In foggy weather, orange warning and greening work should be stopped.

Construction site shutdown is determined according to the urban air quality index. When the Meteorological Observatory has issued a yellow warning of smog, the government will require all construction sites to stop muck transportation, strengthen road sprinkling and dust suppression and cleaning, strengthen the civilized construction management of the city's construction sites, achieve full coverage of bare soil, strengthen the removal of bare garbage in the urban-rural junction, and stop all demolition site operations in the city.