homework

1. Unlike larger dust particles that are visible, it can easily bypass people\'s nose and throat, travelling directly to the lungs and entering the bloodstream. Exposure to fine dust can result in various health issues, including coughing, breathing difficulties, tightness in the chest and irritation of the eyes, nose and throat. Especially, some studies have found that long-term exposure to the particulate matter increases risk of heart attack and stroke. People with underlying cardiovascular and respiratory conditions are especially at risk. 2.On days when fine dust density level is \"bad\" or \"very bad,\" refrain from going outside and minimize exposure to it. Face masks are also highly effective against fine dust. Meanwhile, it is recommended to regularly ventilate indoors space by opening doors and windows at least three times a day. The most important thing is to follow personal hygiene measures such as washing hands, wearing masks and ventilation.