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The AQI is dropping in New York City and Boston ... again.
One thing New Yorkers could always reliably lord over urban Californians was our air. No, our city isn’t perfect — we manage our trash by piling it on the curb and have this pesky thing called “winter” — but at least in recent years our metro area beat San Francisco, Sacramento, and smoggy Los Angeles when it came to the particulates we inhale.
It brings me no joy to report, then, that this spring, tides have turned. Or at least the winds have. East Coasters have evidently inhaled more smoke than most Californians in 2023 due to a quiet start to the wildfire season out West and an explosive start to the one upwind of us in Alberta, Saskatchewan, and now Nova Scotia.
Here’s what the historic AQI has looked like in New York since late April (the yellow spikes mark smoky days):
The historic air quality graph for New York City in spring 2023.IQAir
And here’s what it’s looked like in Boston:
The historic air quality graph for Boston in spring 2023.IQAir
By comparison, here is San Francisco:
The historic air quality graph for San Francisco in spring 2023.IQAir
And Sacramento (note the AQI scale here has changed on the left to out of 50):
The historic air quality graph for Sacramento in spring 2023.IQAir
Though the air quality in Los Angeles has been significantly worse than the AQI in New York or Boston this spring, the yellow “moderate” AQI columns below overlap with a period of heavy urban pollution, rather than wildfire smoke. The yellow columns on the East Coast AQI charts, by contrast, match periods when wildfire smoke blew in from Canada.
The historic air quality graph for L.A. in spring 2023.IQAir
New Yorkers might be surprised to hear they’ve experienced more smoked-tinted sunrises and sunsets this year than Californians, but it checks out: There have been no major (more than 1,000 acres) fires in California yet in 2023. While that might seem unusual, it isn’t; what is unusual are the years like 2021, when the season started in early spring. But 2023 is so far looking to be an average year for California wildfires, which means large burns and regional smoke pollution aren’t expected in the Golden State until late summer and early fall (of course, an El Niño could throw all of this into question).
Meanwhile, in Canada, it is fire season — and it’s been an especially bad one. Almost 5 million acres have already burned, with Alberta on track to have its worst fire year ever. Though smoke from the Canadian fires has blown into a number of northern U.S. states, including Washington and Montana, the jet stream generally carries air east, with some particulate matter making it as far as Boston and New York. (Winds have likewise prevented Canadian wildfire smoke from making it as far southwest as California, hence the unexpected smoke disparity). Over the weekend, a new fire also started in Nova Scotia, causing some 16,000 evacuations around Halifax; the wind has blown much of that smoke southwest, with residents of Connecticut and Massachusetts reporting on Tuesday that they could smell and even taste the smoke.
\u201cSMOKE PLUME...\nFrom Nova Scotia #wildfires creating hazy skies over Boston... sky is much bluer over Worcester. Forecast details coming up at noon on #WCVB\u201d— Cindy Fitzgibbon (@Cindy Fitzgibbon) 1685461877
\u201cAfternoon update... smoke plume continues to move west. There will be about a 4 hour period of reduced air quality. You may smell smoke as this passes through and some fire departments have fielded calls from people wondering what it is. #fox61\u201d— Ryan Breton (@Ryan Breton) 1685460842
The smoke from Canada is also, of course, causing the air quality across the East Coast to plunge. This is not in and of itself a rare occurrence: In 2021, smoke from fires in California likewise caused New York City to experience its worst AQI in 15 years.
East Coast residents may nevertheless feel — incorrectly — that they’re isolated from the dangers of wildfires. In truth, roughly three-quarters of smoke-related asthma cases and deaths occur east of the Rocky Mountains, one study found, due to both population density and wind patterns. Another pre-print study by Stanford researchers that was recently referenced by David Wallace-Wells in The New York Times found similarly that 60 percent of the smoke impact from U.S. wildfires occurs in a different state than the one where the fire is actually burning. Separately, a University of Washington study found that people were 1% more likely to die from “nontraumatic” causes like a heart attack or stroke on a day when they were exposed to wildfire smoke — and 2% more likely the day after.
New Yorkers live in the superior coastal city, but we shouldn’t get too smug about our air. Thinking we’re somehow immune to the West’s smoke problems is patently false
and getting falser. Besides, why should Angelenos get to have all the fun? It’s only fair that we get to obsess over our PurpleAir score, too.
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Plus 3 more outstanding questions about this ongoing emergency.
As Los Angeles continued to battle multiple big blazes ripping through some of the most beloved (and expensive) areas of the city on Thursday, a question lingered in the background: What caused the fires in the first place?
Though fires are less common in California during this time of the year, they aren’t unheard of. In early December 2017, power lines sparked the Thomas Fire near Ventura, California, which burned through to mid-January. At the time it was the largest fire in the state since at least the 1930s. Now it’s the ninth-largest. Although that fire was in a more rural area, it ignited for many of the same reasons we’re seeing fires this week.
Read on for everything we know so far about how the fires started.
Five major fires started during the Santa Ana wind event this week:
Officials have not made any statements about the cause of any of the fires yet.
On Thursday morning, Edward Nordskog, a retired fire investigator from the Los Angeles Sheriff’s Department, told me it was unlikely they had even begun looking into the root of the biggest and most destructive of the fires in the Pacific Palisades. “They don't start an investigation until it's safe to go into the area where the fire started, and it just hasn't been safe until probably today,” he said.
It can take years to determine the cause of a fire. Investigators did not pinpoint the cause of the Thomas Fire until March 2019, more than two years after it started.
But Nordskog doesn’t think it will take very long this time. It’s easier to narrow down the possibilities for an urban fire because there are typically both witnesses and surveillance footage, he told me. He said the most common causes of wildfires in Los Angeles are power lines and those started by unhoused people. They can also be caused by sparks from vehicles or equipment.
At about 27,000 acres burned, these fires are unlikely to make the charts for the largest in California history. But because they are burning in urban, densely populated, and expensive areas, they could be some of the most devastating. With an estimated 2,000 structures damaged so far, the Eaton and Palisades fires are likely to make the list for most destructive wildfire events in the state.
And they will certainly be at the top for costliest. The Palisades Fire has already been declared a likely contender for the most expensive wildfire in U.S. history. It has destroyed more than 1,000 structures in some of the most expensive zip codes in the country. Between that and the Eaton Fire, Accuweather estimates the damages could reach $57 billion.
While we don’t know the root causes of the ignitions, several factors came together to create perfect fire conditions in Southern California this week.
First, there’s the Santa Ana winds, an annual phenomenon in Southern California, when very dry, high-pressure air gets trapped in the Great Basin and begins escaping westward through mountain passes to lower-pressure areas along the coast. Most of the time, the wind in Los Angeles blows eastward from the ocean, but during a Santa Ana event, it changes direction, picking up speed as it rushes toward the sea.
Jon Keeley, a research scientist with the US Geological Survey and an adjunct professor at the University of California, Los Angeles told me that Santa Ana winds typically blow at maybe 30 to 40 miles per hour, while the winds this week hit upwards of 60 to 70 miles per hour. “More severe than is normal, but not unique,” he said. “We had similar severe winds in 2017 with the Thomas Fire.”
Second, Southern California is currently in the midst of extreme drought. Winter is typically a rainier season, but Los Angeles has seen less than half an inch of rain since July. That means that all the shrubland vegetation in the area is bone-dry. Again, Keeley said, this was not usual, but not unique. Some years are drier than others.
These fires were also not a question of fuel management, Keeley told me. “The fuels are not really the issue in these big fires. It's the extreme winds,” he said. “You can do prescription burning in chaparral and have essentially no impact on Santa Ana wind-driven fires.” As far as he can tell, based on information from CalFire, the Eaton Fire started on an urban street.
While it’s likely that climate change played a role in amplifying the drought, it’s hard to say how big a factor it was. Patrick Brown, a climate scientist at the Breakthrough Institute and adjunct professor at Johns Hopkins University, published a long post on X outlining the factors contributing to the fires, including a chart of historic rainfall during the winter in Los Angeles that shows oscillations between very wet and very dry years over the past eight decades. But climate change is expected to make dry years drier in Los Angeles. “The LA area is about 3°C warmer than it would be in preindustrial conditions, which (all else being equal) works to dry fuels and makes fires more intense,” Brown wrote.
And more of this week’s top renewable energy fights across the country.
1. Otsego County, Michigan – The Mitten State is proving just how hard it can be to build a solar project in wooded areas. Especially once Fox News gets involved.
2. Atlantic County, New Jersey – Opponents of offshore wind in Atlantic City are trying to undo an ordinance allowing construction of transmission cables that would connect the Atlantic Shores offshore wind project to the grid.
3. Benton County, Washington – Sorry Scout Clean Energy, but the Yakima Nation is coming for Horse Heaven.
Here’s what else we’re watching right now…
In Connecticut, officials have withdrawn from Vineyard Wind 2 — leading to the project being indefinitely shelved.
In Indiana, Invenergy just got a rejection from Marshall County for special use of agricultural lands.
In Kansas, residents in Dickinson County are filing legal action against county commissioners who approved Enel’s Hope Ridge wind project.
In Kentucky, a solar project was actually approved for once – this time for the East Kentucky Power Cooperative.
In North Carolina, Davidson County is getting a solar moratorium.
In Pennsylvania, the town of Unity rejected a solar project. Elsewhere in the state, the developer of the Newton 1 solar project is appealing their denial.
In South Carolina, a state appeals court has upheld the rejection of a 2,300 acre solar project proposed by Coastal Pine Solar.
In Washington State, Yakima County looks like it’ll keep its solar moratorium in place.
And more of this week’s top policy news around renewables.
1. Trump’s Big Promise – Our nation’s incoming president is now saying he’ll ban all wind projects on Day 1, an expansion of his previous promise to stop only offshore wind.
2. The Big Nuclear Lawsuit – Texas and Utah are suing to kill the Nuclear Regulatory Commission’s authority to license small modular reactors.
3. Biden’s parting words – The Biden administration has finished its long-awaited guidance for the IRA’s tech-neutral electricity credit (which barely changed) and hydrogen production credit.