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Is it safe to turn it on an AC? If you have an air purifier, where should you put it? An air quality expert answers our pressing questions.
You’re in your apartment, windows closed, hiding out from the wildfire smoke blanketing your city. But it’s starting to smell a little bit like barbecue, and your eyes are getting watery. What should you do?
Wildfire smoke contains tiny particles, invisible to the human eye, that can enter your lungs and bloodstream. Those particles can exacerbate the risk of having an asthma attack, heart attack, and stroke. They also have lasting effects on your heart and respiratory system, and can lead to premature death. You really want to take the likelihood that smoke is getting into your home seriously.
But that can lead to a lot of questions.
Maybe you have an air purifier. Where should you put it?
Maybe you don’t have an air purifier, but you have a window air conditioner. Is it safe to turn it on?
I called up John Volckens, a professor of mechanical engineering at Colorado State University, and grilled him on every home configuration I could think of to understand how you can protect yourself against the dangers of smoke. Volckens studies air quality, exposure science, and air pollution-related disease. He has even pioneered the development of new pollution sensor technologies. He had a lot of helpful tips to offer.
It’s important to understand there’s really no way to fully prevent smoke from getting inside your home. Even if you don’t smell it or feel its effects, you should do what you can to protect yourself.
That’s because most homes and buildings “breathe.” As the sun heats the upper reaches of the building, it warms the air, which expands and wants to escape. As the air flows out, the lower part of the house, where it’s cooler, draws new air in to replace it.
“The analogy would be like if a 6-foot flood of water came to your house. It doesn’t matter how many sandbags you have, the water’s coming in, right?” Volckens said. “If the air quality index is like 400 outside for a few hours, it’s going to get to like 200 inside your home no matter what.”
The number one thing you can do is get an air purifier. You might not be able to find one in stores right now or have one delivered in time, but there are other options, too, as I’ll discuss below.
Place it wherever you are.
We spend a third of our lives in bed, so Volckens said he likes to have one in the bedroom. “If you have seasonal allergies, creating that kind of safe space for your immune system can be really helpful,” he told me.
But if you only have one device, when you’re done sleeping, just pick it up and move it into the kitchen, office, or living room with you. It should only take about an hour to work its magic and get whatever room you’re in to the best air quality that it’s capable of.
Window AC units work by recirculating the air in your apartment, so they won’t exacerbate the issue and are generally safe to use. The filters in your window units won’t do much to improve your air, though — they are designed to catch larger particles like dust and animal fur, and smoke particles will slip right through.
If you have a central air conditioning system that delivers cool air through ducts and vents, that’s another story. Those are typically designed to draw in air from the outside. In that case, the best thing to do is install what’s called a MERV filter, which you can purchase at most hardware stores or big box stores. Volckens recommends picking up a filter rated MERV-13, which can capture the smallest particles at a relatively high rate.
“It will probably be like 75% efficient. So if 100 wildfire smoke particles pass through that filter, only 25 will get through,” he said. “You're going to knock down the concentration significantly, especially as that filter keeps cycling air through your home.”
The one thing to keep in mind is that these filters are so good, they will get clogged quickly. A clogged filter will cause your HVAC system to work too hard, which could lead to mechanical issues, so make sure you remember to replace it every couple of months.
What's the alternative to an air purifier?
DIY air filters are surprisingly easy to make and incredibly effective. No, really. All you have to do is buy a box fan, duct tape, and a MERV filter. Tape the filter to the back of the box fan. That’s it.
“They work just as well as commercial air cleaners,” said Volckens. They’re a little bit louder, but otherwise, it’s the exact same idea. “A commercial air purifier might have a fancier fan and a fancier filter, but it’s still just a fan and a filter.”
And if you want to get a little fancier, you can build what’s called a Corsi-Rosenthal box. It’s the same idea, but envelops the fan intake in four filters instead of one. The Washington Post has a very easy-to-follow video showing how to build one. “They work as best as the highest-end air cleaners you could buy for one-fifth or one-tenth of the cost,” said Volckens.
N-95 masks, like the kind recommended to protect against COVID-19, also effectively filter out pollution, and are your best bet. Even a blue surgical mask will be somewhat helpful, said Volckens.
If you’re tired of being cooped up at home, you can also find what Volckens likes to call “clean air zones.” He recommended the public library, a Starbucks, or any other public building. Go support your local movie theater.
“Most public buildings actually have more efficient air cleaning than homes because the buildings were built more recently and they’re built to code standards that require cleaner air.”
Wildfire smoke is truly disgusting. The particles can contain thousands of chemicals, and they will stick to any surface they touch — the ceiling, the carpet, your clothing. You can certainly wash your clothes and linens, but it might not be possible to scrub every surface of your home.
“The best thing you can do when the air does clean up is to just open all your windows and get some good air exchange going,” said Volckens. “I guarantee, yes, you’ll have that wildfire smell for a couple of days, but it will eventually go away.”
Before we hung up, I asked Volckens if there were any other tips we didn’t cover.
“The only thing I’ll say is that this problem isn’t going away,” he said. “And it’s our doing, right? This is the result of a warming planet.”
This article was last updated on June 28, 2023.
Read more about wildfire smoke :
The 5 Big Questions About the 2023 Wildfire Smoke Crisis
Wednesday Was the Worst Day for Wildfire Pollution in U.S. History
When There’s Smoke, Getting Indoors Isn’t Enough
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Renewables developers may yet be able to start construction before the One Big Beautiful Bill deadlines hit.
The Trump administration issued new rules for the wind and solar tax credits on Friday, closing the loop on a question that has been giving developers anxiety since the One Big Beautiful Bill Act passed in early July.
For decades, developers have been able to lock in tax credit eligibility by establishing that they have officially started construction on a project in one of two ways. They could complete “physical work of a significant nature,” such as excavating the project site or installing foundational equipment, or they could simply spend 5% of the total project budget, for instance by purchasing key components and putting them in a warehouse. After that, they had at least four years to start shipping power to the grid before stricter work requirements kicked in.
Shortly after signing the OBBBA, however, Trump issued an executive order directing the Treasury Department to revise its definition of the “beginning of construction” of a wind or solar project. Under the new law, this definition can make or break a project. OBBBA established new deadlines for wind and solar development, allowing projects that start construction before the end of this year to qualify for the tax credits as they currently stand. But projects that start construction between January 1 and July 4 of 2026 will have to follow stringent new rules limiting the use of materials with ties to China in order to qualify.
The start construction date also affects how long a developer has to complete a project and still qualify for credits. Projects that start before July 4 of next year have at least four years, while those that start after must meet an impossibly short timeline of being up and running in just a year and a half, by the end of 2027.
Some worried the new guidance would narrow that four year timeframe or affect project eligibility retroactively. Neither happened. The only major change the Treasury department made to the existing guidance was to get rid of the 5% safe harbor provision. While this is not nothing, and will certainly disqualify some projects that might otherwise have been able to claim the credits, it is nowhere near as calamitous for renewables as it could have been.
Projects can still establish they have started construction by completing “physical work of a significant nature,” and the definition of physical work still includes off-site work, such as the manufacturing of equipment. That means it’s still possible for a company to simply place an order for a custom piece of equipment, like a transformer, to establish their start date — as long as they have a binding contract in place and can demonstrate that the physical production of the equipment is underway.
The new guidance also contains a carve-out that allows solar projects that are less than 1.5 megawatts to use the 5% rule, which will help rooftop solar and smaller community-scale installations.
Trump’s executive order came after a reported deal he made with House Freedom Caucus Republicans who wanted to axe the tax credits altogether. The order directed the Treasury to prevent “the artificial acceleration or manipulation of eligibility” and restrict “the use of broad safe harbors unless a substantial portion of a subject facility has been built.”
Treasury’s relative restraint, then, comes as something of a relief. “It’s not good, it’s not helpful, but from my perspective, the guidance could have been a lot worse,” David Burton, a partner at Norton Rose Fulbright who specializes in energy tax credits, told me. “Utility-scale solar and wind developers should be able to plan around this and not be that harmed.”
That doesn’t mean clean energy groups are happy about the changes, though. “At a time when we need energy abundance, these rules create new federal red tape,” Heather O’Neill, president and CEO of the industry group Advanced Energy United, said in a statement. “These rules will make it more difficult and expensive to build and finance critical energy projects in the U.S.”
The changes don’t go into effect until September 2, so for the next two weeks, all projects can still utilize the 5% safe harbor.
Even though the rules are not the death-blow for projects that some anticipated, there’s still one big unknown that could squeeze development further: The Treasury department has yet to put out guidance related to the new foreign sourcing rules created by the OBBB. One of the big fears there is that companies will have to prove their lack of ties to China so far up their supply chains that compliance becomes impossible.
We probably won’t be left wondering for long, though. Trump’s executive order asked for those rules within 45 days, putting the due date on Monday.
On the worsening transformer shortage, China’s patent boom, and New York’s nuclear embrace
Current conditions: Tropical Storm Erin is still intensifying as it approaches the Caribbean • Rare August rainstorms are deluging the Pacific Northwest with a month’s worth of precipitation in 24 hours, threatening floods • Hong Kong has issued its highest-level “black” rainstorm warning multiple times this month as Tropical Storm Podul lashes southern China.
President Donald Trump’s order to keep large fossil-fueled power stations scheduled to retire between now and 2028 operating indefinitely will cost ratepayers across the United States $3.1 billion per year, according to new research from the consultancy Grid Strategies on behalf of four large environmental groups. If the Department of Energy expands the order to cover all 54 fossil fuel plants slated for closure in the next three years, the price tag for Americans whose rates fund the subsidies to keep the stations running would rise to $6 billion per year.
The problem may only grow. The agency’s existing mandates “perversely incentivize plant owners to claim they plan to retire so they can receive a ratepayer subsidy to remain open,” the report points out.
With electricity consumption hitting new records in the U.S., demand for transformers is surging. The years-long supply shortage for power and distribution transformers is now set to hit a deficit below demand of 30% and 10%, respectively, in 2025, according to a new report from the energy consultancy Wood Mackenzie. Complicating matters further for manufacturers scrambling to ramp up supply, Trump’s One Big Beautiful Bill Act is throwing clean-energy projects into jeopardy and sending mixed signals to factories on what kinds of transformers to produce. At the same time, tariffs are raising the price of materials needed to make more transformers.
“The U.S. transformer market stands at a critical juncture, with supply constraints threatening to undermine the nation's energy transition and grid reliability goals,” Ben Boucher, a senior supply chain analyst at Wood Mackenzie, said in a statement. “The convergence of accelerating electricity demand, aging infrastructure and supply chain vulnerabilities has created constraints that will persist well into the 2030s.”
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A worker in a Chinese electric vehicle factory. Kevin Frayer/Getty Images
For years, China was known for ripping off the West’s technology and patenting cheaper but more easily manufactured copies. Not anymore. China applied for twice as many high-quality clean energy patents as the U.S. in 2022, according to a New York Times analysis of the most recently available public data. The European Patent Office, which supplied data to the Times, defines a “high quality” patent as one that has been filed in two or more countries, indicating that the company or individual involved has a strong competitive interest in protecting its idea.
The growth in China’s intellectual property ambitions is a sign that Beijing’s strategic push to ramp up academic research and industrial innovation is maturing. “It is the opposite of an accident,” said Jenny Wong Leung, an analyst and data scientist at the Australian Strategic Policy Institute, which created a database of global research on technologies that are critical to nations’ economic and military security, including clean energy.
In June, New York Governor Kathy Hochul directed the New York Power Authority, the nation’s second-largest government-owned utility after the federal Tennessee Valley Authority, to support the construction of the state’s first new nuclear plant since the 1980s. Albany has plenty to sort out between now and the 15-year deadline for completing the project, including selecting a site, picking from one of the many new reactor designs, and finding a private partner. But one thing isn’t a problem, at least for now: Public support.
New Siena polling I covered in my Substack newsletter yesterday shows that 49% of registered voters in New York support the effort, with just 26% opposed. Both sides of the political spectrum are largely in lockstep, with Republican support outpacing that of Democrats by a margin of 55% to 49%. That’s lucky for Hochul, who will need support from the more politically conservative upper reaches of the state where the facility is likely to be built. For more on the technical and political considerations in play, here’s Heatmap’s Matthew Zeitlin on the plan.
It seems like everyone is abandoning their net zero goals. But not insurer Aviva. The company’s chief executive, Amanda Blanc, said the British giant remained committed to its carbon-cutting goals in the U.S. and the United Kingdom, The Guardian reported. With rising profits propelling shares in the company to their highest level since the 2008 financial crisis, Blanc said, “extreme weather conditions, climate change, and the impact that that has on our insurance business that actually insures properties” meant Aviva needed to “remain committed to our ambition.”
The red-headed wood pigeon once seemed on the verge of extinction. The population, endemic to Japan’s Ogasawara Islands, fell to below 80 individuals in the 2000s. But once its main predator, the feral cat, was removed, the bird made a remarkable comeback. A team of researchers at Kyoto University set out to find out why the expected problems from inbreeding never occurred. Per a press release: “Their results revealed that the frequency of highly deleterious mutations in the red-headed wood pigeon was lower than in the more widespread Japanese wood pigeon. This suggests that, rather than hindering it, the pigeon's success was likely rooted in its long-term persistence in a small population size prior to human impact.”
And more on the week’s most important conflicts around renewable energy projects.
1. Lawrence County, Alabama – We now have a rare case of a large solar farm getting federal approval.
2. Virginia Beach, Virginia – It’s time to follow up on the Coastal Virginia offshore wind project.
3. Fairfield County, Ohio – The red shirts are beating the greens out in Ohio, and it isn’t looking pretty.
4. Allen County, Indiana – Sometimes a setback can really set someone back.
5. Adams County, Illinois – Hope you like boomerangs because this county has approved a solar project it previously denied.
6. Solano County, California – Yet another battery storage fight is breaking out in California. This time, it’s north of San Francisco.