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The Bootleg Fire rages across central Oregon state, in Klamath County, Oregon, in this July 13, 2021 picture obtained from social media.
Oregon State Fire Marshal | via Reuters

Air quality in the United States and Europe improved over the last decade thanks to stricter environmental regulations, but intensifying wildfires raise new air pollution concerns.

The National Interagency Fire Center reported that, as of August 8, there were 107 large active fires that had burned more than 2.2 million acres domestically across 15 states so far this year. In Europe, wildfires in Greece and Turkey are raging amid record heat waves now as well.

As a result, more people are turning to mobile apps to understand when air quality is better or worse, wherever they may be. These apps use a mix of data from government-operated satellites, or weather, fire and ambient air quality stations, as well as sensors and systems run by private sector entities. Some are even crowdsourced from relatively affordable air quality sensors sold by companies such as PurpleAir and IQAir.

Air quality apps

According to senior mobile insights analyst Jonathan Briskman of Sensor Tower, the top-rated apps for outdoor air quality monitoring in the U.S. between January 2020 and July 2021 have been: AirCare, AirVisual, and South Coast AQMD, based on ratings from the App Store, and Google Play.

The AirCare app shows air pollution, active fires, wind conditions and pollen levels on a map.
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Here’s what those three apps do:

  • AirCare, made by developers in Northern Macedonia, is available for iOS and Android mobile devices, including iPhones, iPads, Apple Watch and Huawei smartphones, among many others. Tiers include a free, ad-supported version, a 99 cents ad-free version, and at the premium level, a $14.99 annual subscription for a pro-version. The app includes kid-friendly air pollution information, charts and maps that show pollutant levels derived from government-run sensors and stations, alongside volunteers’ PurpleAir and other sensors throughout the U.S., Europe and Australia. In some major metro areas, the app also tracks ultra-violet and pollen levels.
  • AirVisual, made by the Swiss air quality company IQAir, tracks air pollution in more than 10,000 cities and 80 countries drawing on data from tens of thousands of sensors, some positioned at U.S. embassies overseas. The company’s free mobile apps are also ad-free and available for iOS and Android devices. Besides real-time maps that show levels of six different types of major pollutants, IQAir’s AirVisual and mobile website provide seven-day air pollution and weather forecasts, along with air pollution-related news and health information. The apps can pair with the company’s own sensors, including the portable AirVisual Pro sold for around $269.
  • South Coast AQMD, is a free and ad-free app run by the local air pollution agency in Southern California of the same name and tracks air pollution across Orange County, Los Angeles, Riverside and San Bernardino, specifically. It features real-time and forecasted air quality and weather conditions, and maps that show where drivers can charge their electric vehicles or find other non-traditional fueling stations. It also includes information about upcoming local events and political hearings related to air quality issues to encourage community participation. The app is available in both English and Spanish for Apple and Android devices.
The South Coast AQMD app shows air pollution levels in Greater Los Angeles.
CNBC

The five most popular air quality apps in the U.S., based on installs since the start of 2020, according to Sensor Tower included two of those top-rated apps, AirVisual (from IQ Air) and Air Care, as well as the U.S. Environmental Protection Agency’s app AirNow, an app from venture-backed startup Breezometer that shows air quality, pollen and active fire data, and an app called Oregon Air developed for the Oregon Department of Environmental Quality.

Use of these apps, and new installs are often driven by regional events. As of August 8, 2021 there were 16 large active fires searing through Oregon according to the NIFC.

How air pollution impacts health

Air quality monitoring and measurement are critical for public health, says Yanelli Nunez, a postdoctoral research scientist at Columbia University’s Mailman School of Public Health.

She notes that robust studies have shown that air pollution contributes to lung cancer, chronic obstructive pulmonary disease, and lower respiratory infections, and even impacts mortality, pregnancy outcomes and cardiovascular disease.

Nunez works in an environmental health sciences laboratory with Marianthi-Anna Kioumourtzoglou. Their research has also found long-term exposure to air pollution can affect the nervous system and may influence functions such as memory or cognitive capabilities.

The scientists wrote in an e-mail to CNBC: “Americans living in poor air quality areas tend to be people of color or low-income communities. We are finally starting to pay more attention to these issues, which hopefully will lead to change. The air pollution composition is also changing.”

In one example, greenhouse gas emissions from transportation declined in New York City from 2014 to 2017, while commercial cooking emissions rose.

With increased wildfires, the scientists wrote, “The sources and composition of the air pollution mixture that we are experiencing could differently impact our health, so we need to better understand source-specific effects, especially for these newly prominent sources.”

Indoor air matters, too

While outdoor air quality is important, society doesn’t talk or do enough about indoor air quality, said Richard Corsi, UC Davis’ incoming dean of the college of engineering, currently a professor and dean at Portland State University.

Using pre-pandemic numbers, Corsi explained that the average American would spend almost 70 out of 79 years of their life domiciled inside of buildings. “Because we spend so much time indoors, even our exposure to pollutants of outdoor origin is dominated by what we breathe there, especially in our homes,” he said.

Pollutants of outdoor origin which come from the likes of internal combustion engine vehicles, photochemical smog, refineries and wildfires can get into homes and buildings when doors and windows are opened, when heat and air conditioning systems are used, or through other cracks in the building envelope.

Consumer apps and devices today don’t give users an absolute, precise measurement down to micrograms per cubic meter of a given pollutant, Corsi noted. But they’re very valuable for spotting trends and relative changes in air quality.

Sensors set up indoors can work well to check whether protective measures are working to improve the air inside of a house, school or other building.

Especially during wildfire season, Corsi said, some other simple actions that can protect or improve air quality indoors include: wet-mopping floors and wiping surfaces so pollutants don’t accumulate, using HEPA or high-efficiency particulate air filters, and increasing the MERV or minimum efficiency reporting value of filters in central air systems in a house.

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Tesla owners are trading in their EVs at record levels, Edmunds says

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Tesla owners are trading in their EVs at record levels, Edmunds says

A Tesla store in Alhambra, California on March 11, 2025.

Frederic J. Brown | AFP | Getty Images

As Elon Musk wraps up his second month in the White House, Tesla owners are trading in their electric vehicles at record levels, according to an analysis by national car shopping site Edmunds.

The data from Edmunds published on Thursday said that March represented “the highest ever share” it had seen for Tesla trade-ins toward new or used cars from dealerships selling other brands.

Since heading to Washington, D.C. in January as a central figure in the second Trump administration, Musk has been slashing the federal workforce and government spending, and has gained access to sensitive government computer systems and data, though his efforts have been repeatedly challenged in court.

Prior to assuming leadership of the Department of Government Efficiency (DOGE), Musk spent around $290 million last year to help propel President Donald Trump back to the White House.

While investors snapped up Tesla shares after Trump’s victory in November, they’ve been rushing for the exits of late, pushing the stock’s price down by 42% this year. Waves of protests have targeted Tesla facilities in the U.S. and beyond. Other criminal acts of vandalism and arson have targeted Tesla stores, vehicles and charging stations across the U.S.

In addition, Tesla is facing increased competition from EV makers. In January, S&P Global Mobility found Tesla sales declined about 11% year-over-year in the U.S., while Ford, Chevrolet and Volkswagen bolstered their sales of EVs, picking up market share.

“Shifts in Tesla consumer sentiment could create an opportunity for legacy automakers and EV startups to gain ground,” Jessica Caldwell, head of insights at Edmunds, wrote in an email. “As Tesla brand loyalty and interest wavers, those offering competitive pricing, new technology, or simply less controversy could capture defecting Tesla owners and first-time EV buyers.”

The Tesla brand, more than that of any other automaker, is tightly tied to its CEO. In August 2024, Edmunds surveys found that just 2% of car shoppers in the U.S. were unfamiliar with Musk.

Edmunds also said that shopping for new models of Tesla vehicles on its platform dropped to its lowest level last month since October 2022 after peaking as late as November.

Even before Musk began heading up DOGE, Tesla’s brand was suffering. Its brand value fell by 26%, or about $15 billion, in 2024, a second straight annual decline, according to research and consulting firm Brand Finance.

Many car shoppers trade in their Tesla EVs for a newer model Tesla. Edmunds data didn’t account for those transactions.

Tesla didn’t immediately respond to a request for comment.

WATCH: Tesla’s core issues more detrimental than short-term political headwinds

Tesla's core issues more detrimental than short-term political headwinds: Wells Fargo's Langan

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Micron shares jump on earnings beat, rosy guidance as data center revenue triples

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Micron shares jump on earnings beat, rosy guidance as data center revenue triples

Signage outside the Micron offices in San Jose, California, on Dec. 17, 2024.

David Paul Morris | Bloomberg | Getty Images

Micron shares popped 6% in extended trading Thursday after the company reported second-quarter results that beat analysts’ estimates and offered better-than-expected guidance.

Here’s how the company did:

  • Earnings per share: $1.56, adjusted vs. $1.42 expected by LSEG
  • Revenue: $8.05 billion vs. $7.89 billion expected by LSEG

Revenue increased 38% from $5.82 billion during the same period in 2024, Micron said in a press release. The memory and storage solutions company reported net income of $1.58 billion, or $1.41 per share, up from $793 million, or 71 cents per share, in the year-ago quarter.

Data center revenue tripled, the company said.

Revenue for the fiscal third quarter will be about $8.8 billion, Micron said, topping the $8.5 billion average analyst estimate, according to LSEG. Adjusted earnings will be roughly $1.57 a share, the company said, beating the $1.47 average estimate.

Prior to Thursday’s close, Micron shares were up 22% for the year, while the Nasdaq is down more than 8%.

Micron will host its quarterly call with investors at 4:30 p.m. ET.

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BlackRock’s head of digital assets says staking could be a ‘huge step change’ for ether ETFs

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BlackRock’s head of digital assets says staking could be a ‘huge step change’ for ether ETFs

Omar Marques | Lightrocket | Getty Images

Appetite for ether ETFs has been tepid since their launch last July, but that could change if some of the regulatory wrinkles holding them back get “resolved,” according to Robert Mitchnick, head of digital assets at BlackRock.

There’s a widely held view that the success of ether ETFs has been “meh” compared to the explosive growth in funds tracking bitcoin, Mitchnick said at the Digital Asset Summit in New York City Thursday. Though he sees that as a “misconception,” he acknowledged that the inability to earn a staking yield on the funds is likely one thing holding them back.

“There’s obviously a next phase in the potential evolution of [ether ETFs],” he said. “An ETF, it’s turned out, has been a really, really compelling vehicle through which to hold bitcoin for lots of different investor types. There’s no question it’s less perfect for ETH today without staking. A staking yield is a meaningful part of how you can generate investment return in this space, and all the [ether] ETFs at launch did not have staking.”

Staking is a way for investors to earn passive yield on their cryptocurrency holdings by locking tokens up on the network for a period of time. It allows investors to put their crypto to work if they’re not planning to sell it anytime soon.

But Mitchnick doesn’t expect a simple fix.

“It’s not a particularly easy problem,” he explained. “It’s not as simple as … a new administration just green-lighting something and then boom, we’re all good, off to the races. There are a lot of fairly complex challenges that have to be figured out, but if that can get figured out, then it’s going to be sort of a step change upward in terms of what we see the activity around those products is.”

The Securities and Exchange Commission has historically viewed some staking services as potential unregistered securities offerings under the Howey Test – which is used to determine whether an asset is an investment contract and therefore, a security. But a more crypto friendly SEC is moving swiftly to reverse the damage done to the industry under the previous regime. Its newly formed crypto task force is scheduled to kick off a roundtable series Friday focused on defining the security status of digital assets.

Ether has been one of the most beaten up cryptocurrencies in recent months. It’s down more than 40% year to date as it has struggled with conflicting and difficult-to-comprehend narratives, weaker revenue since its last big technical upgrade and increasing competition from Solana. Standard Chartered this week slashed its price target on the coin by more than half.

Mitchnick said the negativity is “overdone.”

“ETH … at the second grade level is easier to define … but at the 10th grade level is a lot harder,” he said. “Second grade level: it’s a technology innovation story. … Beyond that, it does get a little more vast, a little more complicated. It’s about being a bet on blockchain adoption and innovation. That’s part of the thesis as we communicate it to clients.”

“There are three [use cases] that we focus on that have a lot of resonance with our client base: it’s a bet to some extent on tokenization, on stablecoin adoption, and on decentralized financing,” he added. “It does take a fair bit of education, and we’ve been on that journey, but it’s going to take more time.”

BlackRock is the issuer of the iShares Ethereum Trust ETF. It also has a tokenized money market fund, known as BUIDL, which it initially launched a year ago on Ethereum and has since expanded to several other networks including Aptos and Polygon.

Don’t miss these cryptocurrency insights from CNBC Pro:

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