The usage of the programmatic API are subjected to a "acceptable usage" policy:

API Usage

• All the APIs are provided for free.
• A valid key must be used for accessing the API.
• All the API are subjected to quota.

The default quota is max 1000 (one thousand) requests per minute (~16RPS) and with burst up to 60 requests.

Data usage

• The data can not be sold or included in sold packages.
• The data can not be used in paid applications or services.
• The data can not be redistributed as cached or archived data.
  

(where data refers to the data obtained from the APIs)
For the historical data, check the data platform page.

App usage

• Attribution to the World Air Quality Index Project as well as originating EPA is mandatory.
• Public usage by for-profit corporations requires explicit agreement wit the World Air Quality Index team.
• Public usage by non-profit organization requires prior notification (by email) to the World Air Quality Index team.

(where app refers to any application, services which make use of the above mentioned data)
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If the above policy does not fulfill your needs, or if you need larger quota, then please contact us first.

Please note that the we reserve the right to change the term of service at any time and without prior notice.

All reasonable measures have been taken to ensure the quality and accuracy of the Data provided by the above APIs. However:

• We do not make warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, correctness, completeness of the information.
• We do not assume any legal liability or responsibility for any damage or loss that may directly or indirectly result from any information contained on this website or any actions taken as a result of the content of this website;

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本网站采用的污染指数和颜色与EPA是完全相同的。 EPA的指数可以从 AirNow上查到

空气质量指数	空气质量指数级别（状况）及表示颜色	对健康影响情况	建议采取的措施
0 - 50	一级（优）	空气质量令人满意，基本无空气污染	各类人群可正常活动
51 -100	二级（良）	空气质量可接受，但某些污染物可能对极少数异常敏感人群健康有较弱影响	极少数异常敏感人群应减少户外活动
101-150	三级（轻度污染）	易感人群症状有轻度加剧，健康人群出现刺激症状	儿童、老年人及心脏病、呼吸系统疾病患者应减少长时间、高强度的户外锻炼
151-200	四级（中度污染）	进一步加剧易感人群症状，可能对健康人群心脏、呼吸系统有影响	儿童、老年人及心脏病、呼吸系统疾病患者避免长时间、高强度的户外锻炼，一般人群适量减少户外运动
201-300	五级（重度污染）	心脏病和肺病患者症状显著加剧，运动耐受力降低，健康人群普遍出现症状	儿童、老年人及心脏病、肺病患者应停留在室内，停止户外运动，一般人群减少户外运动
300+	六级（严重污染）	健康人群运动耐受力降低，有明显强烈症状，提前出现某些疾病	儿童、老年人和病人应停留在室内，避免体力消耗，一般人群避免户外活动

(参考详见 http://zh.wikipedia.org/wiki/空气质量指数)

如果你想了解更多有关空气质量与污染，详见维基百科或者 AirNow

有关健康建议详见北京的Richard Saint Cyr MD医生的博客：www.myhealthbeijing.com