AQI 是什么意思？

AQI（空气质量指数）是一个0-500的标尺，用于综合衡量空气的清洁或污染程度。数值越低越好。本网站上的标尺遵循美国EPA标准：0-50优，51-100良，101-150对敏感人群不健康，151-200不健康，201-300非常不健康，301-500有害。

测量哪些污染物？

PM2.5（细颗粒物）、PM10（可吸入颗粒物）、臭氧（O3）、二氧化氮（NO2）、二氧化硫（SO2）和一氧化碳（CO）。总体空气质量指数由评分最差的污染物决定。

AQI 多久更新一次？

大多数读数来自国家环境机构运营的监测站，每15-60分钟更新一次。部分通过卫星获取的测量数据每隔几小时更新。

什么是PM2.5以及为什么它很重要？

PM2.5指直径小于等于2.5微米的空气悬浮颗粒物——小到可通过肺部进入血液。长期暴露可引发呼吸系统疾病、心脏病和中风。世界卫生组织建议年均浓度低于5微克/立方米。

全球空气质量指数（AQI）监测

全球空气质量监测系统实时追踪细颗粒物（PM2.5）、二氧化硫和氮氧化物水平。大气条件因工业活动、交通密度和天气模式的不同而存在显著区域差异。随时了解您所在地区的当前污染浓度和健康建议。

全球监测

AQI在

按国家浏览空气质量

了解空气质量等级

良好 (0-50)

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

适中 (51-100)

Acceptable air quality, though sensitive groups should monitor comfort.

对敏感人群不健康 (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.

危险 (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.

适中 (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.

危险 (250+)

Lethal particulate concentrations. Critical neurological and lung risk.

良好 (0-54)

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

适中 (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.

危险 (425+)

Extremely high concentrations. Stay inside with filtration.

良好 (0-54)

Surface ozone levels are within a safe, natural range.

适中 (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.

危险 (201+)

Emergency ozone levels. Risk of permanent lung tissue damage.

良好 (0-53)

Nitrogen levels are optimal. Safe for everyone.

适中 (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.

危险 (1250+)

Toxic concentrations. Immediate health precautions required.

良好 (0-4.4)

Carbon Monoxide levels are clean and non-toxic.

适中 (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.

危险 (30.5+)

Lethal potential. Immediate risk of neurological collapse.

良好 (0-35)

Optimal air quality with no sulfur detection.

适中 (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.

危险 (605+)

Extreme respiratory danger. Significant life risk.

健康与科学资源

常见问题

什么是空气质量指数（AQI）？

空气质量指数（AQI）是一种标准化指标，它将PM2.5、PM10、臭氧（O₃）、二氧化氮（NO₂）、二氧化硫（SO₂）和一氧化碳（CO）等污染物的浓度转化为一个从0开始的单一数值。数值越低表示空气越清洁。

什么AQI水平算好？

AQI 0–50 为优，几乎无健康风险；51–100 为中等；101–150 对敏感人群不健康；超过 150 则对所有人不健康。

什么是PM2.5？

PM2.5 是指小于或等于2.5微米的细颗粒物。由于这些颗粒能深入肺部和血液，PM2.5通常是城市空气质量指数(AQI)的主要驱动因素。