AQI 是什麼意思？

AQI（空氣品質指數）是一個0到500的評級，用於總結空氣的清潔或污染程度。數值越低越好。本站採用的評級標準遵循美國環保署（US EPA）的慣例：0-50 良好、51-100 普通、101-150 對敏感族群不健康、151-200 不健康、201-300 非常不健康、301-500 危險。

測量哪些污染物？

PM2.5（細懸浮微粒）、PM10（粗懸浮微粒）、臭氧（O3）、二氧化氮（NO2）、二氧化硫（SO2）和一氧化碳（CO）。整體AQI由分數最差的污染物決定。

AQI 多久更新一次？

多數讀數來自各國環境機構的監測站，每15至60分鐘更新一次。部分衛星測量數據則每隔幾小時更新。

PM2.5 是什麼以及為什麼它很重要？

PM2.5是指直徑小於或等於2.5微米的懸浮微粒，小到可以經由肺部進入血液循環。長期暴露與呼吸道疾病、心臟病和中風有關。世界衛生組織建議年平均濃度低於5 μg/m³。

全球空氣品質指數（AQI）監測

全球空氣品質監測系統追蹤即時細懸浮微粒（PM2.5）、二氧化硫和氮氧化物濃度。大氣條件因工業活動、交通密度和天氣型態而因地而異。隨時了解您所在地區的當前污染濃度與健康建議。

全球監測

AQI 在

依國家瀏覽空氣品質

了解空氣品質等級

良好 (0-50)

Air is fresh and healthy. Safe for all outdoor activities.

適中 (51-100)

Acceptable air quality, though sensitive groups should monitor comfort.

對敏感族群不健康 (101-150)

Vulnerable groups (children, elderly) should limit outdoor exertion.

不健康 (151-200)

Everyone begins to experience health effects. Stay indoors where possible.

非常不健康 (201-300)

Significant health impact for entire population. Emergency conditions.

危險 (301+)

Serious health alert: everyone may experience serious life-threatening effects.

良好 (0-12)

Fine particles are at minimal, safe levels. Air is optimal.

適中 (12-35)

Acceptable air, but haze may be present in urban areas.

敏感 (35-55)

Individuals with heart or lung disease should limit activity.

不健康 (55-150)

Particulate levels high enough to cause respiratory irritation.

非常不健康 (150-250)

Heavy haze. High risk to cardiovascular health for the public.

危險 (250+)

Lethal particulate concentrations. Critical neurological and lung risk.

良好 (0-54)

Low levels of dust and coarse particles. Environment is safe.

適中 (55-154)

Coarse particles may trigger coughing in sensitive groups.

敏感 (155-254)

Visible dust pollution. Sensitive groups should avoid heavy labor.

不健康 (255-354)

Widespread respiratory impacts likely for the population.

非常不健康 (355-424)

Dangerous dust and debris levels. Significant warnings issued.

危險 (425+)

Extremely high concentrations. Stay inside with filtration.

良好 (0-54)

Surface ozone levels are within a safe, natural range.

適中 (55-70)

Acceptable air, but sensitive individuals may feel chest tightness.

敏感 (71-85)

Rising ozone can trigger airway inflammation in active children.

不健康 (86-105)

Avoid heavy outdoor work during the hottest part of the day.

非常不健康 (106-200)

Serious lung function reduction likely across the public.

危險 (201+)

Emergency ozone levels. Risk of permanent lung tissue damage.

良好 (0-53)

Nitrogen levels are optimal. Safe for everyone.

適中 (54-100)

Typical background levels for high-density urban areas.

敏感 (101-360)

Increased risk of respiratory infections for vulnerable groups.

不健康 (361-649)

Significant airway inflammation likely near traffic zones.

非常不健康 (650-1249)

Acute respiratory distress potential. High-risk groups stay indoors.

危險 (1250+)

Toxic concentrations. Immediate health precautions required.

良好 (0-4.4)

Carbon Monoxide levels are clean and non-toxic.

適中 (4.5-9.4)

Acceptable; may affect those with specific heart conditions.

敏感 (9.5-12.4)

Reduced oxygen delivery to the heart may occur.

不健康 (12.5-15.4)

Headaches and fatigue may occur in urban canyons.

非常不健康 (15.5-30.4)

Significant cardiovascular distress. Mental confusion possible.

危險 (30.5+)

Lethal potential. Immediate risk of neurological collapse.

良好 (0-35)

Optimal air quality with no sulfur detection.

適中 (36-75)

Acceptable air; minor odors possible near industry.

敏感 (76-185)

Bronchoconstriction possible for active asthmatics.

不健康 (186-304)

Respiratory distress likely for the wider population.

非常不健康 (305-604)

Significant wheezing and shortness of breath likely.

危險 (605+)

Extreme respiratory danger. Significant life risk.

健康與科學資源

常見問題

空氣品質指數（AQI）是什麼？

空氣品質指數（AQI）是一種標準化量表，將污染物濃度——PM2.5、PM10、臭氧（O₃）、二氧化氮（NO₂）、二氧化硫（SO₂）及一氧化碳（CO）——轉換為從0開始的單一數值。數值越低表示空氣越潔淨。

什麼是良好的AQI指數？

AQI 值在 0–50 之間被認為是良好，對健康幾乎沒有風險。51–100 為中等，101–150 對敏感族群不健康，而高於 150 的數值則對所有人都不健康。

什麼是PM2.5？

PM2.5是指直径2.5微米或更小的细悬浮微粒。由于这些微粒可深入肺部与血液，PM2.5通常是影响城市AQI的主要因素。