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  3. www.gov.hk › en › residentsGovHK: Air Quality Health Index - 香港政府一站通簡

    The Air Quality Health Index (AQHI) compiled by the Environmental Protection Department (EPD) informs the public of the short-term health risk of air pollution in Hong Kong and helps the public take precautionary measures to protect their health.

    • 繁體中文

      此專題文章介紹香港政府提供的空氣質量健康指數（AQHI）和 ...

  4. www.aqhi.gov.hk › en › what-is-aqhiEPD AQHI : What's AQHI

    What is the Air Quality Health Index? To provide more timely and useful air pollution information to the public, the Environmental Protection Department (EPD) launches the Air Quality Health Index (AQHI) to replace the Air Pollution Index (API) from 30 December 2013.

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  6. www.iqair.com › newsroom › what-is-aqiWhat is the air quality index (AQI)? | IQAir

    • Air Pollutants Measured in AQI
    • AQI Categories
    • Differences Between AQI Systems
    • The Takeaway

    There are six air pollutants measured in the index formula, including: 1. PM2.5 2. PM10 3. carbon monoxide 4. sulfur dioxide 5. nitrogen dioxide 6. ground-level ozone An AQI number is assigned based on the air pollutant with the highest AQI number at the moment the air quality is measured. Only pollutants available from a given air quality monitori...

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    Here’s how each of the AQI categories are represented, how they can impact human health, and some recommendations for what to do when the AQI has reached a higher category. The categories are listed from least harmful to human health (“good”) to the most harmful (“hazardous”).

    在「iqair.com」查看更多資訊

    There are different systems used around the world for measuring air quality. The United States and China AQI systems are the most widely used systems – both measure the same group of air pollutants. However, each system rates AQI scores from 200 and lower differently.2 The U.S. AQI system generally yields higher scores for AQI under 200 because low...

    在「iqair.com」查看更多資訊

    The air quality index reinterprets potentially complex air quality data into a meaningful number with corresponding categories of pollutant concentrations and associated health effects. Please note, though, that there is no safe level of air pollution, in particular as the AQI reaches closer to 50 and beyond. By knowing whether the air we breathe i...

    在「iqair.com」查看更多資訊

  7. en.wikipedia.org › wiki › Air_quality_indexAir quality index - Wikipedia

    The Ministry of Environment of South Korea uses the Comprehensive Air-quality Index (CAI) to describe the ambient air quality based on the health risks of air pollution. The index aims to help the public easily understand the air quality and protect people's health.

  8. www.aqhi.gov.hk › en › what-is-aqhiEPD AQHI : FAQs

    The Air Quality Health Index (AQHI) is a health risk-based air pollution index. It provides an estimate of the short-term (hospital admission) risk of heart and respiratory diseases from air pollution.

  9. waqi.infoWorld's Air Pollution: Real-time Air Quality Index

    The Air Quality Index is based on measurement of particulate matter (PM 2.5 and PM 10), Ozone (O 3), Nitrogen Dioxide (NO 2), Sulfur Dioxide (SO 2) and Carbon Monoxide (CO) emissions. Most of the stations on the map are monitoring both PM 2.5 and PM 10 data, but there are few exceptions where only PM 10 is available.

  10. www.iqair.com › world-air-quality-rankingWorld Air Quality Index (AQI) Ranking | IQAir

    99. San Francisco, USA. 29. 670.4K followers. 100. Helsinki, Finland. 28. 81.4K followers. Keep track of the most polluted cities in the world with our air quality index (AQI) ranking.

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