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The Environmental Protection Agency finalized new air pollution rules on Wednesday, strengthening standards that had not been updated in over a decade. Somewhat counterintuitively, the change could mean that even as the air gets cleaner, you might get more air quality alerts.
As part of the rule change, the EPA updated its Air Quality Index, that colorful scale that many Americans grew intimately familiar with last summer, as wildfire smoke went from being a West Coast problem to a hazard for almost the entire country, seemingly overnight.
The AQI is both easy to interpret, with a color code that goes from a healthy green to a perilous purple, and esoteric. The colors correspond with numbers from zero to upwards of 300, and those numbers correspond with measures of five different pollutants — particulate matter, ozone, carbon monoxide, sulfur dioxide, and nitrogen dioxide.
The Clean Air Act tasks the EPA with setting standards for each of these pollutants. If local concentrations of any one of them tick up above those protective standards, the AQI will jump from green to a more alarming color. The higher the level of pollution is, the higher the AQI and the darker the color will be.
Previously, the EPA’s annual standard for concentrations of particulate matter was 12 micrograms per cubic meter (µg/m3). Based on epidemiological research showing that this standard did not adequately protect public health, the agency has now lowered the standard to 9 µg/m3.
Air quality has improved immensely since the 1970s when the Clean Air Act was passed, preventing hundreds of thousands of premature deaths. But thousands of people still die early, are rushed to the emergency room, develop asthma, or miss work due to air pollution.
The new AQI scale doesn’t mean you need to rethink how you make decisions about when to spend time outdoors or whether to wear a mask. But it does mean that if and when people make decisions based on the AQI, they will be more informed by the science and, in aggregate, contribute to lower all of these public health costs. The rules are expected to prevent 4,500 premature deaths per year by 2032.
All AQI scores above 300 are considered hazardous, but identifying a top value for the scale helps the EPA determine the actual score.Environmental Protection Agency
Some parts of the country could start to see more days with “moderate air quality,” the yellow category. “People who live in places that have frequent flips over nine — those will be people who have environmental justice issues or live near traffic and industries and big cities and so forth — they are going to get warned a little more,” John Bachmann, a former associate director in EPA’s Office of Air and Radiation told me. “Which is a positive thing.” The agency considers moderate air quality to be “acceptable,” but there may still be a risk for people who are particularly sensitive to pollution.
Also, during major air quality events like wildfires or chemical fires, impacted areas could now be deemed “hazardous” when previously they may have been “very unhealthy,” or deemed “very unhealthy” when before they would have been simply “unhealthy.” This will affect when and how public health officials respond to these kinds of events.
“This is for everybody, not just the most exposed or the most sensitive people. So on both ends of it, this is a step in the right direction,” Bachmann said.
As part of the changes, the agency will also now require cities with more than 350,000 people to report the AQI seven days a week, up from five — a rule that’s been in place since 1999. However, the agency said that most states and cities are already doing this.
The new AQI scale will take effect in 60 days, in early April.
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The Department of Energy announced Wednesday that it was scrapping the loan guarantee.
The Department of Energy canceled a nearly $5 billion loan guarantee for the Grain Belt Express, a transmission project intended to connect wind power in Kansas with demand in Illinois that would eventually stretch all the way to Indiana.
“After a thorough review of the project’s financials, DOE found that the conditions necessary to issue the guarantee are unlikely to be met and it is not critical for the federal government to have a role in supporting this project. To ensure more responsible stewardship of taxpayer resources, DOE has terminated its conditional commitment,” the Department of Energy said in a statement Wednesday.
The $11 billion project had been in the works for more than a decade and had won bipartisan approval from state governments and regulators across the Midwest. The conditional loan guarantee announced in November 2024 would have secured up to $4.9 billion in financing to fund phase one of the project, which would run from Ford County in Kansas to Callaway County in Missouri.
In response to a request for comment, an Invenergy spokesperson said, “While we are disappointed about the LPO loan guarantee, a privately financed Grain Belt Express transmission superhighway will advance President Trump’s agenda of American energy and technology dominance while delivering billions of dollars in energy cost savings, strengthening grid reliability and resiliency, and creating thousands of American jobs.”
The project had long been the object of ire from Missouri Senator Josh Hawley, who recently stepped up his attacks in the hopes that a more friendly administration could help scrap the project. Two weeks ago, Hawley posted on X that he’d had “a great conversation today with @realDonaldTrump and Energy Secretary Chris Wright. Wright said he will be putting a stop to the Grain Belt Express green scam. It’s costing taxpayers BILLIONS! Thank you, President Trump.” The New York Times later reported that Trump had made a call to Wright on the issue with Hawley in the Oval Office.
Hawley celebrated the Grain Belt Express decision, writing on X, “It’s done. Thank you, President Trump,” and exulting in a separate post that “Department of Energy officially TERMINATES taxpayer funding for Green New Deal ‘grain belt express.’”
The senator had claimed that the plan would hurt Missouri farmers due to the use of eminent domain to acquire land for the project. In 2023, Hawley wrote a letter to Invenergy chief executive Michael Polsky claiming that “your company’s Grain Belt Express construction campaign has hurt Missouri’s farmers,” and that “they have lost the use of arable land, seen their property values decline, and been forced to operate under a cloud of uncertainty.”
Controversy over eminent domain and the use of agricultural land by transmission lines illustrates the difficulties in building the long-distance energy infrastructure necessary to decarbonize the grid.
Opposition to the project had been gestating for years but picked up steam in recent weeks. Earlier this month, Andrew Bailey, the Republican attorney general of Missouri, announced an investigation into the project. “This is a HUGE win for Missouri landowners and taxpayers who should not have to fund these green energy scams,” he wrote on X Wednesday following the DOE’s announcement.
As the project appeared to be more imminently imperiled, Invenergy scrambled to preserve its future, including making plans to connect gas to the transmission line. In a letter to Secretary of Energy Chris Wright written earlier this month, the Invenergy vice president overseeing the project wrote that the Grain Belt Express “has been the target of egregious politically motivated lawfare,” echoing language President Trump has used to describe his own travails.
If the author’s intent was to generate sympathy from the administration, it didn’t work. The end of the loan guarantee could be a death blow to the project, and will at the very least force Invenergy into a mad dash to try to match the lost capital.
Editor’s note: This story has been updated to include a comment from Invenergy.
CEO Mark Zuckerberg confirmed the company’s expanding ambitions in a Threads post on Monday.
Meta is going big to power its ever-expanding artificial intelligence ambitions. It’s not just spending hundreds of millions of dollars luring engineers and executives from other top AI labs (including reportedly hundreds of millions of dollars for one engineer alone), but also investing hundreds of billions of dollars for data centers at the multi-gigawatt scale.
“Meta is on track to be the first lab to bring a 1GW+ supercluster online,” Meta founder and chief executive Mark Zuckerberg wrote on the company’s Threads platform Monday, confirming a recent report by the semiconductor and artificial intelligence research service Semianalysis.
That first gigawatt-level project, Semianalysis wrote, will be a data center in New Albany, Ohio, called Prometheus, due to be online in 2026, Ashley Settle, a Meta spokesperson, confirmed to me. Ohio — and New Albany specifically — is the home of several large data center projects, including an existing Meta facility.
At the end of last year, Zuckerberg said that a datacenter project in Northeast Louisiana, now publicly known as Hyperion, would take 2 gigawatts of electricity; in his post on Monday, he said it could eventually be as large as 5 gigawatts. To get a sense of the scale we’re talking about, a new, large nuclear reactor has about a gigawatt of capacity, while a newly built natural gas plant could supply only around 500 megawatts.
As one could perhaps infer from the fact that their size is quoted in gigawatts instead of square feet or number of GPUs, whether or not these data centers get built comes down to the ability to power them.
Citing information from the natural gas company Williams, Semianalysis reported that Meta “went full Elon mode” for the New Albany datacenter, i.e. is installed its own natural gas infrastructure. Specifically, Williams is building two 200-megawatt facilities, according to the gas developer and Semianalysis, for the Ohio project. (Williams did not immediately respond to a Heatmap request for comment.)
Does this mean Meta is violating its commitments to reach net zero? While the data center buildout may make those goals more difficult to achieve, Meta is still investing in new renewables even as it’s also bringing new gas online. Late last month, the company announced that it was procuring almost 800 new megawatts of renewables from projects to be built by Invenergy, including over 400 megawatts of solar in Ohio, roughly matching the on-site generation from the Prometheus project.
But there’s more to a data center’s climate footprint than what a big tech company does — or does not — build on site.
The Louisiana project, Hyperion, will also be served by new natural gas and renewables added to the grid. Entergy, the local utility, has proposed 1.5 gigawatts of natural gas generation near the Meta site and over 2 gigawatts of new natural gas in total, with another plant in the southern part of the state to help balance the addition of significant new load. In December, when the data center was announced, Meta said that it planned to “bring at least 1,500 megawatts of new renewable energy to the grid.” Entergy did not immediately respond to a Heatmap request for comment on its plans for the Hyperion project.
“Meta Superintelligence Labs will have industry-leading levels of compute and by far the greatest compute per researcher. I'm looking forward to working with the top researchers to advance the frontier!” Zuckerberg wrote.
“I believe the tariff on copper — we’re going to make it 50%.”
President Trump announced Tuesday during a cabinet meeting that he plans to impose a hefty tax on U.S. copper imports.
“I believe the tariff on copper — we’re going to make it 50%,” he told reporters.
Copper traders and producers have anticipated tariffs on copper since Trump announced in February that his administration would investigate the national security implications of copper imports, calling the metal an “essential material for national security, economic strength, and industrial resilience.”
Trump has already imposed tariffs for similarly strategically and economically important metals such as steel and aluminum. The process for imposing these tariffs under section 232 of the Trade Expansion Act of 1962 involves a finding by the Secretary of Commerce that the product being tariffed is essential to national security, and thus that the United States should be able to supply it on its own.
Copper has been referred to as the “metal of electrification” because of its centrality to a broad array of electrical technologies, including transmission lines, batteries, and electric motors. Electric vehicles contain around 180 pounds of copper on average. “Copper, scrap copper, and copper’s derivative products play a vital role in defense applications, infrastructure, and emerging technologies, including clean energy, electric vehicles, and advanced electronics,” the White House said in February.
Copper prices had risen around 25% this year through Monday. Prices for copper futures jumped by as much as 17% after the tariff announcement and are currently trading at around $5.50 a pound.
The tariffs, when implemented, could provide renewed impetus to expand copper mining in the United States. But tariffs can happen in a matter of months. A copper mine takes years to open — and that’s if investors decide to put the money toward the project in the first place. Congress took a swipe at the electric vehicle market in the U.S. last week, extinguishing subsidies for both consumers and manufacturers as part of the One Big Beautiful Bill Act. That will undoubtedly shrink domestic demand for EV inputs like copper, which could make investors nervous about sinking years and dollars into new or expanded copper mines.
Even if the Trump administration succeeds in its efforts to accelerate permitting for and construction of new copper mines, the copper will need to be smelted and refined before it can be used, and China dominates the copper smelting and refining industry.
The U.S. produced just over 1.1 million tons of copper in 2023, with 850,000 tons being mined from ore and the balance recycled from scrap, according to United States Geological Survey data. It imported almost 900,000 tons.
With the prospect of tariffs driving up prices for domestically mined ore, the immediate beneficiaries are those who already have mines. Shares in Freeport-McMoRan, which operates seven copper mines in Arizona and New Mexico, were up over 4.5% in afternoon trading Tuesday.