case there is a risk of the structure getting damaged during the emergency, it is desirable to
have alternate wind sock(s) as required. At least one wind sock should be visible from any part
of the site. Site personnel have to be trained in reading the atmospheric conditions on the basis
of the status of the wind sock.
It is useful in toxic release that are strongly influenced by wind speed, weather condition, leak rate or mass released at particular place.
Also in Fire Emergency that will guide Fire Fighters for Fire Fighting and General Employees/People for evacuation route from that site.
It may be used in Industries where Chances of Air Pollution / or for studying the Plume behavior of Chimney/ Stack.
In legal back up as per my knowledge there is no direct requirement as per Factories Act but it will under purview of Section 7A(c) General duties of Occupier for providing information / instruction; and Section 41B (4) i.e. preparing Onsite Emergency plan.
17th February 2015 From India, Vapi