It is recommended to ventilate for 48-72 hours after the thermometer is broken, because the mercury will be scattered on the ground after the thermometer is broken, and the main chemical composition of mercury is mercury, which is toxic and harmful to human health. Mercury evaporates 2 hours later can make the body appear headache, nausea, vomiting, coughing, and even breathing difficulty symptoms, serious can cause damage to the central nervous system and respiratory system, so we should recommend timely ventilation. In addition, aluminum foil should be used to collect the mercury scattered on the ground, while placed in an airtight container and then discarded, so as to meet the requirements of environmental protection.