🇭🇰 Hong Kong, Hong Kong 的空氣品質指數（AQI）
Hong Kong 居民健康建議
空氣品質可接受。但某些污染物可能對極少數人造成中度健康疑慮。敏感族群應考慮減少長時間戶外活動。
Hong Kong 空氣污染：詳細污染物分析
如何解讀空氣品質指數 Hong Kong
Air is fresh and healthy. Safe for all outdoor activities.
Acceptable air quality, though sensitive groups should monitor comfort.
Vulnerable groups (children, elderly) should limit outdoor exertion.
Everyone begins to experience health effects. Stay indoors where possible.
Significant health impact for entire population. Emergency conditions.
Serious health alert: everyone may experience serious life-threatening effects.
Fine particles are at minimal, safe levels. Air is optimal.
Acceptable air, but haze may be present in urban areas.
Individuals with heart or lung disease should limit activity.
Particulate levels high enough to cause respiratory irritation.
Heavy haze. High risk to cardiovascular health for the public.
Lethal particulate concentrations. Critical neurological and lung risk.
Low levels of dust and coarse particles. Environment is safe.
Coarse particles may trigger coughing in sensitive groups.
Visible dust pollution. Sensitive groups should avoid heavy labor.
Widespread respiratory impacts likely for the population.
Dangerous dust and debris levels. Significant warnings issued.
Extremely high concentrations. Stay inside with filtration.
Surface ozone levels are within a safe, natural range.
Acceptable air, but sensitive individuals may feel chest tightness.
Rising ozone can trigger airway inflammation in active children.
Avoid heavy outdoor work during the hottest part of the day.
Serious lung function reduction likely across the public.
Emergency ozone levels. Risk of permanent lung tissue damage.
Nitrogen levels are optimal. Safe for everyone.
Typical background levels for high-density urban areas.
Increased risk of respiratory infections for vulnerable groups.
Significant airway inflammation likely near traffic zones.
Acute respiratory distress potential. High-risk groups stay indoors.
Toxic concentrations. Immediate health precautions required.
Carbon Monoxide levels are clean and non-toxic.
Acceptable; may affect those with specific heart conditions.
Reduced oxygen delivery to the heart may occur.
Headaches and fatigue may occur in urban canyons.
Significant cardiovascular distress. Mental confusion possible.
Lethal potential. Immediate risk of neurological collapse.
Optimal air quality with no sulfur detection.
Acceptable air; minor odors possible near industry.
Bronchoconstriction possible for active asthmatics.
Respiratory distress likely for the wider population.
Significant wheezing and shortness of breath likely.
Extreme respiratory danger. Significant life risk.
這個 AQI 是如何計算的？
上方顯示的主要空氣品質指數 (AQI) 是使用 美國 EPA 線性插值 公式，基於 PM2.5 濃度（細懸浮微粒）計算的。
- 目前 PM2.5： 23.15 µg/m³
- 計算： 您的城市屬於「適中」類別（類別 2）。
注意：雖然會監測多種污染物（O3、NO2、SO2），但 PM2.5 被用作主要指數值的「驅動因子」，因為它通常代表最高的健康風險。
常見問題
Hong Kong 空氣污染的主要原因是什麼？
Hong Kong 的污染主要受到 11.2 公里/小時的 SSW 風、當地交通排放和工業活動影響，這些因素導致目前的 PM2.5 濃度為 23.15 µg/m³。
今天 Hong Kong 的 AQI 安全嗎？
今天的 AQI 為 77，歸類為 適中。這表示空氣品質對一般民眾 適中。