The best – and worst – countries for air pollution and electricity use

China steals an unsavory global spotlight for the thick, noxious smog that often chokes its mega-cities.

Air pollution has become so bad in Beijing, for example, that Chinese officials aim to slash its local coal consumption by 30% in 2017.

Meanwhile, the US — which currently ranks eighth on the list of countries with the lowest air pollution — could be headed in the opposite direction.

President Donald Trump has said that he intends to fulfill his campaign promise of revitalizing the American coal industry, despite the criticism of fossil fuel industry analysts and the rise of affordable sources of renewable energy. Congress is also working to repeal numerous environmental and health regulations.

With these and other changes afoot, it’s worth taking a look at current global rankings to see how China, the US, and other countries stack up when it comes to air quality, total energy use, and renewable contributions to power production.

Here the best and worst of 135 countries according to World Health Organization (WHO) and International Energy Agency data, which was shared with Business Insider by The Eco Experts, a UK-based solar energy comparison site.

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Image: International Energy Agency/World Health Organisation (via The Eco Experts)

There are many ways to measure air pollution, but a key indicator is called “PM 2.5” — one of the most harmful classes of airborne pollutants.

The “PM” stands for “particulate matter,” and the “2.5” stands for 2.5 microns in diameter or smaller — roughly the size of a single bacterium. Such pollution, as Business Insider’s Lydia Ramsey explained in 2016, “is especially dangerous because it can get lodged in the lungs and cause long-term health problems like asthma and chronic lung disease.”

When PM 2.5 levels go above roughly 35 micrograms per cubic meter of air, it can become a major health problem. The WHO recommends keeping PM 2.5 levels to about 10 micrograms per cubic meter.

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