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World air quality (AQI) ranking

  • Changelog: 2018 World Air Quality Report

    <p class="no-margin">On the IQAir platform, all ground-based stations are attributed to a contributor and data source for data transparency and acknowle...

  • Air quality ranking disclaimer

    <p class="no-margin">On the IQAir platform, all ground-based stations are attributed to a contributor and data source for data transparency and acknowle...

  • Since data measured by AirVisual monitors are used in the ranking, how accurate are AirVisual data?

    Since data measured by AirVisual monitors are used in the ranking, how accurate are AirVisual data?

  • What are some of the major sources or causes of ambient air pollution?

    What are some of the major sources or causes of ambient air pollution?

  • Why are the WHO Air Quality Guidelines used when different countries have different ambient air quality requirement?

    Why are the WHO Air Quality Guidelines used when different countries have different ambient air quality requirement?

  • Why is the US Air Quality Index used in the ranking?

    Why is the US Air Quality Index used in the ranking?

  • How precise is the ranking?

    <p class="no-margin">On the IQAir platform, all ground-based stations are attributed to a contributor and data source for data transparency and acknowle...

  • How precise is the ranking?

    <p class="no-margin">On the IQAir platform, all ground-based stations are attributed to a contributor and data source for data transparency and acknowle...

  • How is historical data being incorporated in the ranking dataset?

    <p class="no-margin">On the IQAir platform, all ground-based stations are attributed to a contributor and data source for data transparency and acknowle...

  • How is historical data being incorporated in the ranking dataset?

    <p class="no-margin">On the IQAir platform, all ground-based stations are attributed to a contributor and data source for data transparency and acknowle...

  • What is the data availability rule in the ranking?

    What is the data availability rule in the ranking?

  • Is missing data from stations common? How is the missing data treated in this ranking and which countries have bad data quality?

    Is missing data from stations common? How is the missing data treated in this ranking and which countries have bad data quality?

  • What are the steps taken to ensure the quality of data of the ranking?

    What are the steps taken to ensure the quality of data of the ranking?

  • How is the ranking air quality data collected, processed and calculated?

    <p class="no-margin">On the IQAir platform, all ground-based stations are attributed to a contributor and data source for data transparency and acknowle...

  • How is the ranking air quality data collected, processed and calculated?

    <p class="no-margin">On the IQAir platform, all ground-based stations are attributed to a contributor and data source for data transparency and acknowle...

  • What are the data sources for this air quality ranking?

    What are the data sources for this air quality ranking?

  • How are the yearly PM2.5 yearly measurements for country/region calculated?

    <p class="no-margin">On the IQAir platform, all ground-based stations are attributed to a contributor and data source for data transparency and acknowle...

  • How are the yearly PM2.5 yearly measurements for country/region calculated?

    <p class="no-margin">On the IQAir platform, all ground-based stations are attributed to a contributor and data source for data transparency and acknowle...

  • Why is PM2.5 chosen for this ranking?

    Why is PM2.5 chosen for this ranking?

  • Why is the air quality ranking data different from governmental/official data?

    Why is the air quality ranking data different from governmental/official data?

  • Why are some cities and countries not listed in this air quality ranking?

    Why are some cities and countries not listed in this air quality ranking?