World air quality (AQI) ranking

Your questions answered, on IQAir's 2018 World Air Quality Report

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17 articles in this collection
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Changelog: 2018 World Air Quality Report

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Air quality ranking disclaimer

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

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

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

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

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How precise is the ranking?

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How is historical data being incorporated in the ranking dataset?

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

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What is the data availability rule in the ranking?

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

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

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What are the data sources for this air quality ranking?

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

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Why is PM2.5 chosen for this ranking?

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

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

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