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If you’re of a certain age, you probably remember the hole in the ozone layer. Like Joseph Kony and Livestrong wristbands, the obsession over O3 now feels like a cultural artifact, thanks to ozone depletion being one of the rare success stories of international environmental cooperation. Since the world banned chlorofluorocarbons under the Montreal Protocol in 1987, the holes over the North and South poles have steadily recovered.
Today, if you hear about “ozone” at all, it’s much more likely to be from an air quality alert on your phone. Unlike the stratospheric ozone that we were all so concerned about in the 1980s and 1990s, which makes up a protective layer around the planet that insulates us from the sun’s cancer-causing ultraviolet rays, “tropospheric” or “ground-level” ozone is mainly man-made. In fact, when people throw around the word “pollution,” what they’re probably talking about is ground-level ozone, which is created by a chemical reaction between nitrogen oxides (highly reactive gases produced by burning fuels) and volatile organic compounds (organic compounds that easily evaporate under normal environmental conditions and can be found in vehicle exhaust as well as scented personal care products like deodorants, lotions, and bug sprays), plus sunlight. This chemical reaction usually occurs when cars, refineries, power plants, and other industrial sources emit pollutants into the environment during a hot, clear day. You probably know the result by its other name: smog.
Ozone is a climate issue not just because it is yet another concerning consequence of burning fossil fuels. According to some estimates, high levels of ground-level ozone pollution could grow in frequency by three to nine additional days per year by 2050 because of the gas’s close relationship with intense sunlight and high temperatures. While ozone dissipates fairly quickly once those conditions go away, it can build up while they last. Hot days, which are increasing in the U.S., also coincide with weak winds and stagnant air — conditions that allow ozone to accumulate in one place.
When the temperatures start to rise, here’s what you need to know and what you can do to protect yourself and others from ozone pollution.
Different pollutants cause concern at different concentrations. The Air Quality Index is designed so that, in theory, a level of “100” corresponds to the point at which people in sensitive populations might start to be affected by the pollutant in question. (To learn more about how the AQI is calculated, you can read our explainer here).
That said, “The evidence has clearly been increasing that lower levels of ozone — levels well below the current standard of 70 parts per billion — are causing more health impacts,” Katherine Pruitt, the national senior director of policy at the American Lung Association, which is campaigning to strengthen the standard to 55 to 60 parts per billion, told me.
As Pruitt explained, ozone is a caustic irritant and can corrode metals. Breathing it in can cause inflammation in anyone, “from vulnerable children and elders to even the fittest elite athletes,” Pruitt said, adding that it is, “at some level, like getting a sunburn on your lungs.” Anyone who spends time outside is vulnerable to ozone, but the more sensitive groups — including children; the elderly; people with asthma, chronic heart disease, and other diseases; and pregnant women — are at a higher risk. They might already be paying more attention to the AQI levels in their area, and will potentially notice that they need to slow down and limit exertion during “yellow” or “orange”-level ozone events.
In the short term, ozone pollution can cause coughing, shortness of breath, and a lowered immune response, on top of aggravating any preexisting lung conditions or diseases. But Pruitt stressed to me that “living in places that have high levels of ozone day in and day out, for months and years, can cause respiratory diseases, nervous system disorders, metabolic disorders, reproductive problems, and mortality. It’s not just a cough and a wheeze on one bad air day.”
Ozone requires two main ingredients: the burning of fossil fuels and other chemicals, and sunlight. While ozone concentrations can be high in communities with a lot of industry and freeways nearby, ozone is “not really so much a roadway problem; it’s more of what we call an ambient air pollutant,” Pruitt said. Ozone can travel far away from where it was produced, in other words.
There are some rules of thumb, though. The places with the highest emissions and most appropriate atmospheric conditions for ozone pollution are “increasingly the western U.S. and the Southwest,” Pruitt said. The top four worst cities for ozone on the 2024 State of the Air report by the ALA were all in California, led by Los Angeles and Long Beach.
Since the passage of the Clean Air Act in 1963, other regions of the country have been doing much better, including the Southeast, mid-Atlantic, and Northeast. (Bangor, Maine, had the cleanest air in the report.)
Because ozone is so strongly related to sunlight, it does not cause indoor air pollution to the same extent as wildfire smoke(which, if you’re keeping score, is a PM2.5 pollutant). “Because it’s so reactive, it gloms onto your furniture and your walls and stuff, once it gets inside,” Pruitt said of ozone. To protect yourself, you can just stay indoors and run your air conditioner.
But what if you want or need to go out? Because ozone is a gas rather than a particle, HEPA filters and face masks won’t protect you. Instead, Pruitt said that you can time your errands, tend to your garden, and exercise when the sunlight is the weakest — mornings, especially, tend to be less demanding on the lungs during ozone events.
The Clean Air Act of 1963 requires the Environmental Protection Agency to review the national ambient air quality standards for ozone (as well as several other pollutants) every five years. “It almost never actually does it every five years” though, Pruitt said. “Sometimes advocates have to sue them to get them to move things along.” The EPA completed its last review in December 2020, with the Trump administration maintaining the 70 parts per billion standard set in 2015. Attacks on the Clean Air Act would likely resume if Trump retakes office.
Aside from agitating for stricter clean air standards, there are measures you can take to protect others from ozone events. The simplest is not to contribute any more nitrogen oxides and volatile organic compounds to the environment than you otherwise have to when ozone levels are high. Avoid driving or idling your car; top off your tank during the coolest parts of the day, such as after dark; minimize your electricity use; and set your air conditioner no lower than 78 degrees.
In the long term, reducing ozone pollution will mean “choosing greener products for cleaning and personal care, so that we’re not producing volatile organic compounds,” Pruitt told me. The National Oceanic and Atmospheric Administration previously found that in New York City in 2018, “about half” of the ambient volatile organic compounds it measured were produced by people, not vehicle exhaust. (Here’s a guide to reducing VOCs from your rotation.)
Additionally, “transitioning to zero-emission technologies so we're not burning fossil fuels” will help limit ozone pollution, Pruitt said. The difference can be pretty significant: A study from the University of Houston published earlier this month found that by switching to electric vehicles, New York and Chicago could prevent 796 and 328 premature pollution-related deaths per month, respectively. Counterintuitively, the study found that more EVs on the roads could increase mortality in Los Angeles due to a corresponding increase in secondary organic aerosols caused by complicated dynamics between nitrogen oxides and volatile organic compounds and the city’s unique geography. “This underscores the need for region-specific environmental regulations,” the authors said.
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From Kansas to Brooklyn, the fire is turning battery skeptics into outright opponents.
The symbol of the American battery backlash can be found in the tiny town of Halstead, Kansas.
Angry residents protesting a large storage project proposed by Boston developer Concurrent LLC have begun brandishing flashy yard signs picturing the Moss Landing battery plant blaze, all while freaking out local officials with their intensity. The modern storage project bears little if any resemblance to the Moss Landing facility, which uses older technology,, but that hasn’t calmed down anxious locals or stopped news stations from replaying footage of the blaze in their coverage of the conflict.
The city of Halstead, under pressure from these locals, is now developing a battery storage zoning ordinance – and explicitly saying this will not mean a project “has been formally approved or can be built in the city.” The backlash is now so intense that Halstead’s mayor Dennis Travis has taken to fighting back against criticism on Facebook, writing in a series of posts about individuals in his community “trying to rule by MOB mentality, pushing out false information and intimidating” volunteers working for the city. “I’m exercising MY First Amendment Right and well, if you don’t like it you can kiss my grits,” he wrote. Other posts shared information on the financial benefits of building battery storage and facts to dispel worries about battery fires. “You might want to close your eyes and wish this technology away but that is not going to happen,” another post declared. “Isn’t it better to be able to regulate it in our community?”
What’s happening in Halstead is a sign of a slow-spreading public relations wildfire that’s nudging communities that were already skeptical of battery storage over the edge into outright opposition. We’re not seeing any evidence that communities are transforming from supportive to hostile – but we are seeing new areas that were predisposed to dislike battery storage grow more aggressive and aghast at the idea of new projects.
Heatmap Pro data actually tells the story quite neatly: Halstead is located in Harvey County, a high risk area for developers that already has a restrictive ordinance banning all large-scale solar and wind development. There’s nothing about battery storage on the books yet, but our own opinion poll modeling shows that individuals in this county are more likely to oppose battery storage than renewable energy.
We’re seeing this phenomenon play out elsewhere as well. Take Fannin County, Texas, where residents have begun brandishing the example of Moss Landing to rail against an Engie battery storage project, and our modeling similarly shows an intense hostility to battery projects. The same can be said about Brooklyn, New York, where anti-battery concerns are far higher in our polling forecasts – and opposition to battery storage on the ground is gaining steam.
And more on the week’s conflicts around renewable energy.
1. Carbon County, Wyoming – I have learned that the Bureau of Land Management is close to approving the environmental review for a transmission line that would connect to BluEarth Renewables’ Lucky Star wind project.
2. Nantucket County, Massachusetts – Anti-offshore wind advocates are pushing the Trump administration to rescind air permits issued to Avangrid for New England Wind 1 and 2, the same approval that was ripped away from Atlantic Shores offshore wind farm last Friday.
3. Campbell County, Virginia – The HEP Solar utility-scale project in rural Virginia is being accused of creating a damaging amount of runoff, turning a nearby lake into a “mud pit.” (To see the story making the rounds on anti-renewables social media, watch this TV news segment.)
4. Marrow County, Ohio – A solar farm in Ohio got approvals for once! Congratulations to ESA Solar on this rare 23-acre conquest.
5. Madison County, Indiana – The Indiana Supreme Court has rejected an effort by Invenergy to void a restrictive county ordinance.
6. Davidson County, North Carolina – A fraught conflict is playing out over a Cypress Creek Renewables solar project in the town of Denton, which passed a solar moratorium that contradicts approval for the project issued by county officials in 2022.
7. Knox County, Nebraska – A federal judge has dismissed key aspects of a legal challenge North Fork Wind, a subsidiary of National Grid Renewables, filed against the county for enacting a restrictive wind ordinance that hinders development of their project.
8. Livingston Parish, Louisiana – This parish is extending a moratorium on new solar farm approvals for at least another year, claiming such action is necessary to comply with a request from the state.
9. Jefferson County, Texas – The city council in the heavily industrial city of Port Arthur, Texas, has approved a lease for constructing wind turbines in a lake.
10. Linn County, Oregon – What is supposed to be this county’s first large-scale solar farm is starting to face pushback over impacts to a wetlands area.Today’s sit-down is with Nikhil Kumar, a program director at GridLab and an expert in battery storage safety and regulation. Kumar’s folks reached out to me after learning I was writing about Moss Landing and wanted to give his honest and open perspective on how the disaster is impacting the future of storage development in the U.S. Let’s dive in!
The following is an abridged and edited version of our conversation.
So okay – walk me through your perspective on what happened with Moss Landing.
When this incident occurred, I’d already been to Moss Landing plenty of times. It caught me by surprise in the sense that it had reoccurred – the site had issues in the past.
A bit of context about my background – I joined GridLab relatively recently, but before that I spent 20 years in this industry, often working on the integrity and quality assurance of energy assets, anything from a natural gas power plant to nuclear to battery to a solar plant. I’m very familiar with safety regulation and standards for the energy industry, writ large.
Help me understand how things have improved since Moss Landing. Why is this facility considered by some to be an exception to the rule?
It’s definitely an outlier. Batteries are very modular by nature, you don’t need a lot of overall facility to put battery storage on the ground. From a construction standpoint, a wind or solar farm or even a gas plant is more complex to put together. But battery storage, that simplicity is a good thing.
That’s not the case with Moss Landing. If you look at the overall design of these sites, having battery packs in a building with a big hall is rare.
Pretty much every battery that’s been installed in the last two or three years, industry has already known about this [risk]. When the first [battery] fire occurred, they basically containerized everything – you want to containerize everything so you don’t have these thermal runaway events, where the entire battery batch catches fire. If you look at the record, in the last two or three years, I do not believe a single such design was implemented by anybody. People have learned from that experience already.
Are we seeing industry have to reckon with this anyway? I can’t help but wonder if you’ve witnessed these community fears. It does seem like when a fire happens, it creates problems for developers in other parts of the country. Are developers reckoning with a conflation from this event itself?
I think so. Developers that we’ve talked to are very well aware of reputational risk. They do not want people to have general concern with this technology because, if you look at how much battery is waiting to be connected to the grid, that’s pretty much it. There’s 12 times more capacity of batteries waiting to be connected to the grid than gas. That’s 12X.
We should wait for the city and I would really expect [Vistra] to release the root cause investigation of this fire. Experts have raised a number of these potential root causes. But we don’t know – was it the fire suppression system that failed? Was it something with the batteries?
We don’t know. I would hope that the details come out in a transparent way, so industry can make those changes, in terms of designs.
Is there anything in terms of national regulation governing this sector’s performance standards and safety standards, and do you think something like that should exist?
It should exist and it is happening. The NFPA [National Fire Prevention Association] is putting stuff out there. There might be some leaders in the way California’s introduced some new regulation to make sure there’s better documentation, safety preparedness.
There should be better regulation. There should be better rules. I don’t think developers are even against that.
OK, so NFPA. But what about the Trump administration? Should they get involved here?
I don’t think so. The OSHA standards apply to people who work on site — the regulatory frameworks are already there. I don’t think they need some special safety standard that’s new that applies to all these sites. The ingredients are already there.
It’s like coal power plants. There’s regulation on greenhouse gas emissions, but not all aspects of coal plants. I’m not sure if the Trump administration needs to get involved.
It sounds like you're saying the existing regulations are suitable in your view and what’s needed is for states and industry to step up?
I would think so. Just to give you an example, from an interconnection standpoint, there’s IEEE standards. From the battery level, there are UL standards. From the battery management system that also manages a lot of the ins and outs of how the battery operates —- a lot of those already have standards. To get insurance on a large battery site, they have to meet a lot of these guidelines already — nobody would insure a site otherwise. There’s a lot of financial risk. You don’t want batteries exploding because you didn’t meet any of these hundreds of guidelines that already exist and in many cases standards that exist.
So, I don’t know if something at the federal level changes anything.
My last question is, if you were giving advice to a developer, what would you say to them about making communities best aware of these tech advancements?
Before that, I am really hoping Vistra and all the agencies involved [with Moss Landing] have a transparent and accountable process of revealing what actually happened at this site. I think that’s really important.