Bird nests are becoming a popular health and nutrition food. Malaysia is one of the five countries in the world that has a swallow nest industry. Apart from Malaysia, the other four countries that run the industry are Indonesia, Thailand, Vietnam, and the Philippines. At a price of over RM10,000 per kg, it is a protected national treasure. Malaysia is now ensuring that haze problems can be minimized as haze can affect the production of swallows' nests.