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Featured Article

What is radon? Learn about this dangerous gas found in homes

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Radon can be found in far too many homes. Find out what you can do about it.

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Woman seen blowing her nose

Scientists confirm allergy season is really getting longer, more severe

Allergy season is getting longer and more intense every year, with spring allergies starting about two weeks earlier than usual. Learn more. Read More >

Woman seen blowing her nose

Scientists confirm allergy season is really getting longer, more severe

Allergy season is getting longer and more intense every year, with spring allergies starting about two weeks earlier than usual. Learn more. Read More >

Mosquito landing on someone

How to choose a safe mosquito repellent

As a result over concerns about the Zika virus, sales of some popular products rose as much as 150% over the previous year. Unfortunately, many insecticides and bug sprays contain dangerous chemicals that pose new dangers to human health. Read More >

Mosquito landing on someone

How to choose a safe mosquito repellent

As a result over concerns about the Zika virus, sales of some popular products rose as much as 150% over the previous year. Unfortunately, many insecticides and bug sprays contain dangerous chemicals that pose new dangers to human health. Read More >

Heatmap showing the highest concentrations of air pollution

2 billion children breathing unsafe outdoor air worldwide

Unicef report highlights unique vulnerability of children to air pollution globally Read More >

Image of dental professional and child in dental office

Do silver crowns contain mercury?

Can dental silver crowns be hazardous? In this article, we will discuss everything you need to know before getting dental silver crowns. Read More >

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Steps to ensure the quality of data

Any values determined to be erroneous through this data analysis process were discounted. Learn more. Read More >

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Is missing data from stations common?

It’s not uncommon for hourly measurements to be missing from real-time sources for a few reasons. Read More >

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

Some outlier figures may affect the mean average produced by the government. Read More >

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How yearly PM2.5 score calculated

Learn more about how the yearly PM2.5 yearly measurements for country/region are calculated. Read More >

World Heat Map_1

How yearly PM2.5 score calculated

Learn more about how the yearly PM2.5 yearly measurements for country/region are calculated. Read More >

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What is data availability rule?

Learn more about what the data availability rule in the ranking is. Read More >

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