Mapped: Air Pollution Levels Around the World
The World Health Organization (WHO) estimates that air pollution leads to 7 million premature deaths every year.
Out of the six common air pollutants, particulate matter measuring 2.5 microns or smaller in diameter, or PM2.5, is accepted as the most harmful to human health. This is due to its prevalence in the atmosphere and the broad range of adverse health effects associated with its exposure, such as heart disease, stroke, lung cancer and chronic respiratory diseases.
With that context in mind, this visualization uses IQAir’s World Air Quality Report to map out the 2022 average PM2.5 concentrations in select major cities around the globe, expressed in micrograms per cubic meter (μg/m³).
Understanding the WHO Air Pollution Guidelines
Did you know that in 2019, only 1% of the global population lived in places where WHO global air quality guidelines were met?
Designed to protect public health from the harmful effects of air pollution, the guidelines cover a range of air pollutants, including particulate matter, ozone, nitrogen dioxide, sulfur dioxide, and carbon monoxide.
The healthy limits for PM2.5 are set at an annual average of 0-5 μg/m³.
|WHO Classification||Annual Average PM2.5 Concentration (μg/m³)||% of countries within classification, 2022*|
|WHO Air Quality Guideline||0 - 5||9.9%|
|Interim Target 4||5.1 - 10||18.3%|
|Interim Target 3||10.1 - 15||19.8%|
|Interim Target 2||15.1 - 25||28.2%|
|Interim Target 1||25.1 - 35||9.9%|
|Exceeds Target Levels||35.1 - 50||7.6%|
|Exceeds Target Levels||> 50||6.1%|
*Percentages are calculated as a proportion of the 131 countries that had sufficient air quality data and were included in IQAir’s World Air Quality Report in 2022.
According to IQAir’s World Air Quality Report, only 13 countries or territories met the recommended concentration of PM2.5 in 2022. Among them were Australia, Finland, Puerto Rico, Iceland, Bermuda, and Guam.
Above this guideline, many countries fell within the four interim targets, while nearly 14% recorded air pollution levels that exceeded all target levels.
The Effects of Air Quality on Mortality
While it can be a little difficult to grasp what the above concentrations represent, thinking of them in terms of their effect on mortality can shed some light on their significance.
According to the WHO, non-accidental mortality rates multiply by 1.08 per 10 µg/m³ increase in PM2.5 concentration, but only up to 35 μg/m³. Above that, mortality growth rates may not be linear, resulting in many more deaths.
Here is an example to highlight what that means.
- Say that, for a population living within the WHO PM2.5 guideline, the non-accidental mortality rate is arbitrarily set to 100 deaths for a given period.
- If this area’s PM2.5 concentration goes up to 10 μg/m³, putting them at Interim Target 4, they would see 104 deaths in that same amount of time.
- At Interim Target 3, where their PM2.5 concentration would be 15 μg/m³, they would see 108 deaths.
- At Interim Target 2, they’d see 117.
- Finally, at Interim Target 1, they’d see 126.
Beyond Interim Target 1 (above 35 μg/m³), deaths would potentially grow much faster. As of 2022, around 14% of countries report levels above this threshold, including Chad, India, Pakistan, Qatar, and Nigeria.
The State of Air Pollution Around the World
While many cities in North America and Europe have seen steady and relatively lower PM2.5 concentrations during the last few years, many cities (especially those in Asia) have been making strides in lowering their air pollution levels.
Nonetheless, many of them still record PM2.5 concentrations that are more than six times the WHO guideline.
|City||2022 annual average PM2.5 concentration (μg/m³)||2018 annual average PM2.5 concentration (μg/m³)|
|🇪🇬 Cairo, Egypt||47.4||N/A|
|🇮🇳 Mumbai, India||46.7||58.6|
|🇦🇪 Dubai, UAE||43.7||55.3|
|🇮🇩 Jakarta, Indonesia||36.2||45.3|
|🇳🇬 Lagos, Nigeria||36.1||N/A|
|🇨🇳 Beijing, China||29.8||50.9|
|🇵🇪 Lima, Peru||25.6||28|
|🇲🇽 Mexico City, Mexico||22.1||19.7|
|🇨🇳 Guangzhou, China||21.3||33.2|
|🇵🇭 Manila, Philippines||14.6||N/A|
|🇦🇷 Buenos Aires, Argentina||14.2||12.4|
|🇸🇬 Singapore, Singapore||13.3||14.8|
|🇮🇹 Rome, Italy||12.6||N/A|
|🇰🇪 Nairobi, Kenya||11.5||N/A|
|🇷🇺 Moscow, Russia||10.8||10.1|
|🇧🇷 Rio de Janeiro, Brazil||10.6||N/A|
|🇺🇸 Los Angeles, USA||10.5||14.4|
|🇺🇸 New York, USA||9.9||N/A|
|🇬🇧 London, UK||9.6||12|
|🇯🇵 Tokyo, Japan||9.2||13.1|
|🇨🇦 Toronto, Canada||8.5||7.8|
|🇨🇦 Vancouver, Canada||7.6||N/A|
|🇳🇴 Oslo, Norway||6.9||8.2|
|🇿🇦 Cape Town, South Africa||6.7||N/A|
|🇺🇸 Miami, USA||6.4||7.8|
|🇦🇺 Perth, Australia||4.9||N/A|
|🇦🇺 Sydney, Australia||3.1||7.6|
Most parts of the world did not meet the annual WHO recommendation for clean and healthy air in 2022.
However, the cost of inaction toward cleaner air is very high. In addition to the millions of premature deaths each year, the global cost of health damages associated with air pollution currently sits at $8.1 trillion.
Unfortunately, things that are integral to our quality of life, such as industrial activities, transportation, energy production, and agricultural practices, are also the leading causes of air pollution around the world.
As such, a multi-faceted approach to lowering pollution is essential to protect lives, especially to benefit those already more vulnerable to poor air quality, such as kids and the elderly.
The Frequency of Billion-Dollar Disasters in the U.S.
The Maui fire is the latest of many disasters in the U.S. And data shows that frequency of costly weather disasters has increased.
Frequency of Billion-Dollar Disasters in the U.S.
Wildfires on the Hawaiian island of Maui have had devastating effects on people, towns, and nature, and the final cost is nowhere near tallied. They are the latest of many climate disasters in the U.S.—and data shows that their frequency has been increasing.
These graphics from Planet Anomaly use tracking data from the National Oceanic and Atmospheric Administration (NOAA) to show the average number of days between billion-dollar weather disasters in the U.S. from 1980 to 2022.
NOAA’s database examines billion-dollar weather and climate disasters in America. Total associated damages and costs for each event are adjusted for inflation using the 2023 Consumer Price Index (CPI).
Disasters are categorized as one of seven different types:
- Drought: Prolonged dry spells resulting in water shortages and reduced soil moisture.
- Flooding: Overflow of water inundating land usually due to intense rainfall or melting snow.
- Tropical Cyclone: Intense rotating storm systems known as hurricanes.
- Severe Storm: Includes windstorms and tornadoes, hail, lightning, and heavy precipitation.
- Winter Storm: Heavy snow, freezing rain, and icy conditions impacting transportation and infrastructure.
- Wildfire: Uncontrolled fires consuming vast areas of forests and vegetation.
- Freezes: Sub-zero temperatures damaging crops and infrastructure, such as pipes or energy lines.
The average days between billion-dollar disasters are calculated from the start dates of adjacent events within a single year.
Days Between Billion-Dollar Disasters in the U.S. (1980‒2022)
Between 1980 and 2022, there were 155 total disasters in the U.S. that cost more than a billion dollars in damages when adjusted for inflation.
And when looking at the average number of days between these billion-dollar events within each year, we can see the decades becoming more and more costly:
|Year||Avg. Days Between Disasters|
Back in the early 1980s, the average interval between these major disasters (within each year) was 75 days. Even more starkly, 1987 had no climate disasters that topped $1 billion in damages, while 1988 only had one.
Fast forward to 2022, and that average window has drastically reduced to a mere 20 days between billion-dollar disasters in the United States.
Breaking Down Billion-Dollar Disasters by Type
Of the 155 disasters tracked through 2022, the majority have been in the form of severe storms including tornadoes, windstorms, and thunderstorms.
The worst severe storms include an outbreak of tornadoes in April 2011 across many central and southern states, with an estimated 343 tornadoes causing a total of $14 billion in CPI-adjusted damages. In August 2020, a powerful derecho—a widespread and intense windstorm characterized by straight-line winds—devastated millions of acres of crops across the Midwest and caused $13 billion in adjusted damages.
But the most expensive disasters so far have been hurricanes. Eight hurricanes top the inflation-adjusted damages charts, with Hurricane Katrina’s unprecedented devastation in 2005 leading with a staggering $194 billion.
Will the U.S. be prepared for more costly disasters going forward? And will climate change continue to accelerate the pace of weather disasters in the U.S. even more?
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