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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?

    <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 some of the major sources or causes of ambient air pollution?

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

    <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 the US Air Quality Index used in 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...

  • What is the data availability rule in 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...

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

    <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 steps taken to ensure the quality of data of 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 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?

    <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?

    <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 the air quality ranking data different from governmental/official data?

    <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 are some cities and countries not listed in this air quality 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...