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The Brief

The most important stories for you to know today
  • Health workers and visitors need to mask up
    Mask and gloves.
    Mask and gloves.

    Topline:

    Los Angeles County public health officials reinstated a mask requirement at health care facilities as seasonal viral illnesses climb.

    Where are masks required? Health workers and visitors to hospitals, nursing homes, dialysis centers, primary care clinics and other health facilities need to wear a mask to prevent infecting vulnerable patients.

    Why now? A recent upswing in COVID-19 cases sent more people to the hospital and pushed the county into the Centers for Disease Control and Prevention's "medium" COVID level. The mask order will end when COVID cases decline, but it’s also aimed at curbing flu cases. California has very high flu activity according to the CDC. About 23% of people tested for flu were positive, the highest so far this season in L.A. County.

    Los Angeles County public health officials reinstated a mask requirement at health care facilities as respiratory virus infections — including COVID-19 and the flu — increase.

    "Over the past week in Los Angeles County, there have been notable, yet not unexpected, increases in COVID-19 reported cases, hospitalizations and deaths," the L.A. County Department of Public Health said in a press release. "While recent increases are significant, they remain considerably below last winter's peak and common-sense protections are strongly recommended to help curb transmission and severe illness as the new year begins."

    An upswing in recent COVID cases have pushed the county into the Centers for Disease Control and Prevention’s “medium” COVID level. The threshold for the medium level is between 10 and 19.9 new COVID hospital admissions per 100,000 population over seven days.

    For the week ending Dec. 23, the CDC reported 10.5 new COVID hospital admissions per 100,000 people in L.A. County, a 30% increase from the prior week.

    COVID-19 cases rose by more than 25% from 495 in the week ending Dec. 16 to 621 in the week ending Dec. 23. Health officials noted the actual number of cases is likely much higher because many people use at-home kits to test for the virus.

    “Sadly, there has also been an appreciable increase in the daily average deaths due to COVID-19,” the health department said, also reporting an average of five deaths due to COVID per day in the last week of December — an increase from two at the beginning of the month.

    The public health order issued Dec. 27 will remain in effect until L.A. County drops back into the CDC’s “low” category for two weeks, and applies to health workers and visitors in patient care areas of hospitals, nursing homes, dialysis centers, primary care clinics and other health care facilities.

    The order isn’t just aimed at curbing COVID-19 cases.

    Influenza is sending hundreds of people to L.A. hospitals. During the week ending Dec. 23, on average 85 Angelenos a day were hospitalized with flu, and more than 10% of emergency department visits in L.A. County were for flu-like symptoms. About 23% of people tested for flu were positive, the highest so far this season.

    California has “very high” flu activity, according to the CDC.

    Nationally, the CDC estimates that there have been more than seven million illnesses, 73,000 hospitalizations and 4,500 deaths related to the flu this season, and multiple indicators are high and rising.

    HERE’S HOW TO GET HELP PREVENTING AND TREATING COVID-19

    • Finding a mask that works can be bewildering. Here is a list from the CDC of tested N-95 masks by manufacturer that have passed stringent testing.
    • The federal government is allocating each household an additional four free COVID-19 home tests. Information on where to find tests, including a link to order free tests by mail, is available here
    • Paxlovid, the antiviral medication to treat COVID-19, is provided free to residents through the Public Health Call Center at (833)540-0473, open seven days a week from 8 a.m. to 8 p.m.

    Respiratory syncytial virus — or RSV — activity is showing signs of slowing in L.A. County, but many measures, including hospitalization rates, remain elevated. About 10% of people tested positive for RSV, just below COVID-19’s positivity rate of 12%. Overall, young children and older adults are most affected.

    As seasonal virus activity surges, experts stress the importance of preventative actions such as masking and vaccinations and treatment for those who get sick.

    “Stay home if you are sick and test if you have symptoms or were exposed to COVID-19, especially when visiting with people who are more vulnerable to severe illness due to age or underlying health conditions,” L.A. County health officials said in a press release. “Wash your hands often and a well-fitted, high-quality mask can help protect against transmission in crowded indoor spaces, including airports, train stations or places with poor ventilation.”

  • ChatGPT uses less water than almonds?
    Sam Altman, co-founder and CEO of OpenAI, testifying before a Senate committee in 2025.

    Topline:

    As Gov. Gavin Newsom weighs whether to require data centers to disclose how much water they use, OpenAI CEO Sam Altman says concerns over AI’s water use don’t hold “up to any scrutiny.”

    Why now: On the Sources Podcast with Alex Heath released Tuesday, Altman said that it takes 38,000 ChatGPT queries to use as much water as producing a single almond in California.

    So is he right? Keep reading to find out.

    As Gov. Gavin Newsom weighs whether to require data centers to disclose how much water they use, OpenAI CEO Sam Altman says concerns over AI’s water use don’t hold “up to any scrutiny.”

    On the Sources Podcast with Alex Heath released Tuesday, Altman said that it takes 38,000 ChatGPT queries to use as much water as producing a single almond in California.

    “If you look at a modern very large data center, it uses the equivalent amount of water as an office building in terms of, you know, people like running the sinks and the toilets and whatever,” Altman told Heath.

    The problem, experts say, is that it’s impossible to verify those numbers given what’s public about the secretive industry.

    “The information we have is so limited,” said Shaolei Ren, a professor of electrical and computer engineering at UC Riverside.

    Far too many factors affect how much water data centers use to boil it down to any one convenient statistic, Ren said, rattling off a handful of variables: the data center’s location, the temperature outside, the type of cooling system, the length of the prompt, the reasoning required, the output. All affect how much water the data center uses.

    “This is the whole reason that these bills need the governor’s signature,” said Michael Kiparsky, director of the Wheeler Water Institute at the UC Berkeley Center for Law, Energy, & the Environment. “There’s no published data — certainly not for California — and what is public seems all over the place.”

    Over the past two weeks, California lawmakers passed two bills by Assemblymember Diane Papan aimed at increasing transparency; both now await Newsom’s signature.

    One would require operators to report their water sources and usage when seeking business permits. The other would block local governments from approving new data centers unless developers disclose their water plans. They’d also have to pay for any water upgrades needed to connect to the local supply.

    It’s the San Mateo Democrat’s second attempt at more transparency around data center water use. Newsom vetoed her bill last year, saying he was “reluctant to impose rigid reporting requirements … without understanding the full impact on businesses and the consumers of their technology.”

    The heavy-hitting tech industry and business groups again opposed the bills. But now, as data center fights erupt across the state and local governments ban the facilities outright amid a wider bipartisan backlash, the question of how much water data centers really use is gaining urgency.

    “If we know what an almond uses, maybe we can figure out what a data center uses?” said Alex Biering, director of policy advocacy who specializes in water issues for the California Farm Bureau Federation.

    What the data actually shows

    Regardless of whether it takes thousands of queries to match the water needed to produce a single almond in California (a number that varies substantially over time and space, according to a 2019 study), the Congressional Research Service says data centers are using more water than they used to. 

    One study reported the facilities directly used about 17 billion gallons in 2023, up from 5.6 billion gallons in 2014. Another report found that hyperscale data centers could use 150 billion gallons of water from 2025 to 2030 — which is as much water as 4.6 million households use in the U.S. in a year.

    Annual water use isn’t the whole story, Ren cautioned. The hottest days, when data centers require the most cooling, can substantially increase peak water demand, according to Ren’s research, which is under review by a scientific journal and available online as a preprint.

    “For community water systems, the peak capacity is more important because they need to be designed and built to accommodate the peak demand at all times, similar to our power grid,” Ren said.

    Ren’s team found that data center cooling systems could call for 697 to 1.45 billion more gallons of peak water capacity per day. It’s comparable to New York City’s average daily supply, the study says. And unlike irrigation water typically used for farms, water for data centers is often treated, potable water from public water systems, the team reported.

    That’s a problem, because water systems across the country — and certainly in California — are “aging, fragmented, and/or financially constrained, thus lacking sufficient available capacity to meet the additional peak water demands of large data centers.”

    The researchers pointed to examples in Georgia and Virginia where water suppliers worried they “just don’t have the water” to accommodate peak demand from the data centers drawing from their systems simultaneously.

    Ren said water use could drop by as much as 50% if data centers opt for less water-intensive cooling systems, like dry cooling, but there are tradeoffs — such as increased energy needs.

    And that, too, requires water.

  • Sponsored message
  • Bass and Raman lay out environmental platforms
    Two women in suit jackets hold mics and gesture as the address an audience.
    L.A. Mayor Karen Bass and Councilmember Nithya Raman separately explain their environmental positions at a mayoral forum held Thursday at L.A. Trade Tech in downtown Los Angeles.

    Topline:

    The two candidates for L.A. mayor defended their environmental records and painted two different pictures of the city on Thursday during a forum on climate and environment issues.

    The details: Incumbent Mayor Karen Bass and City Councilmember Nithya Raman each answered questions separately about how they would approach many environmental challenges facing the city, including emergency preparedness, water resiliency and transportation policy.

    The takeaways: Bass said L.A. has made solid progress on transitioning to clean energy and other environmental challenges, while Raman argued the city has fallen behind. Bass defended her role in the city’s response to the Palisades and Boyle Heights warehouse fires, while Raman criticized it for lacking effective guidance and communication for victims.

    Read on…for more takeaways from the forum.

    With a little more than two months to go until the general election, the two mayoral candidates running to lead the city of Los Angeles fielded questions about the environment at a Thursday night forum hosted by LAist.

    Incumbent Karen Bass and her challenger, L.A. City Councilmember Nithya Raman, each answered questions separately about how they would approach many environmental challenges facing the city, including emergency preparedness, water resiliency and transportation policy.

    These and other environmental and climate issues are top of mind for many Angelenos during a summer marked by extreme heat, humidity and the Lineage warehouse fire in Boyle Heights that affected surrounding neighborhoods for months. Communities are also still rebuilding from last year’s destructive Eaton and Palisades fires.

    The forum, held at Los Angeles Trade Technical-College, was organized by the L.A. League of Conservation Voters, SCOPE-LA, Sierra Club, Clean and Healthy California, Neighborhood Council Sustainability Alliance and Communities for a Better Environment, and was moderated by LAist climate and environment Reporter Erin Stone.

    Here are three takeaways from the event:

    Differing visions of LA

    Bass, who was elected mayor in 2022, painted a picture of an L.A. that’s made significant progress on environmental issues during that time, while Raman said the city has stalled under Bass’ leadership.

    Bass referenced her work transitioning the city off of coal-generated energy and expanding the city’s electric bus fleets and clean-energy jobs. She said she wants to build on that momentum, particularly with a focus on helping communities impacted by environmental and industrial pollution.

    She pointed to many communities of color that bear the brunt of industrial pollution, including in South L.A. neighborhoods dotted with oil wells and residents who live in close proximity to the Lineage warehouse in Boyle Heights.

    “Where we need to go now in the future is focusing on environmental justice, focusing on the communities that are disproportionately impacted by greenhouse gases and by the environment,” she said.

    Raman also talked about a need to focus on environmental justice, but she said environmental programs are underfunded and understaffed, and that she would invest more in them if she becomes mayor.

    She said Bass’ administration has not prioritized environmental climate issues enough, and that there should be a more aggressive policy around them.

    “Too much of that work remains unfinished,” she said. “Our transition to clean energy has slowed. Efforts to build a resilient water supply, close neighborhood drilling sites, make our streets safer, all of these have slowed over the last four years.”

    Raman specifically called out Bass for her proposal to cut funding for the Climate Emergency Mobilization Office as the city faced a billion-dollar budget shortfall last year.

    Bass defended the proposal, arguing the program had not developed a climate action plan as directed and needed to be revamped.

    The office has shrunk under Bass’ leadership, and she removed the city’s chief heat officer and quietly appointed a new one earlier this year.

    Emergency response failures

    Both Bass and Raman said L.A. has room for improvement when it comes to preparing for fires, earthquakes and other disasters.

    Raman criticized the city’s response to last year’s Palisades Fire, saying there was no clear leadership to guide the community through the recovery effort. She pointed to Bass' appointment of Steve Soboroff to head the recovery. He left the post after his three-month term and was not replaced.

     ”What we saw in the Palisades, I think, was an example of what shouldn't happen,” Raman said. “ A lot of residents in the Palisades have been feeling like they don't know who to reach out to, who is the person that they need to connect with in order to make sure that recovery really happens.”

    But she defended her administration’s response, and said confusion over city and state land made it more difficult.

     ”Part of the brush was the city, part of the brush was the state. There was a reluctance to go into state territory because our folks were told they couldn't do that,” Bass said. “As far as I'm concerned, that's not gonna happen again.”

    Bass said the biggest impediments to the recovery process — and to people moving back into their homes — are insurance companies and banks. She called for legislative reforms to the insurance process.

    Raman also criticized the response to the Lineage warehouse fire in Boyle Heights this summer, calling out Bass directly for sharing misleading information about air quality.

    Bass said she relied on inaccurate information from public health and air quality management officials.

    Both candidates said there’s a need for stronger enforcement and higher fines that could be levied against corporations like Lineage, the warehouse owner, and better planning for emergencies around industrial buildings.

    Shared goals

    Although the candidates leaned into their differences, the reality is that they align on many climate and environmental policies.

    Unhoused Angelenos are especially at risk from extreme heat, and Bass said the city needs to provide more places for them to cool off.

    “My plan, priority one, is to get people off the streets,” Bass said, adding that during heat emergencies that needs to include providing emergency shelters and other ways to cool off.

    Raman talked about similar solutions.

    “ Responding to people who are experiencing homelessness to ensure that they're actually able to get indoors and off the streets, so that they're not dying from exposure to heat, because that is a very, very high risk that people who are experiencing homelessness face,” she said.

    They had other shared goals.

    Both said incentives and rebates that keep down the cost of utility bills need to be more accessible, especially in low-income communities.

    Both called for more severe penalties for owners of industrial sites like the Boyle Heights warehouse.

    And they both said they want to grow the city’s electric vehicle fleet, and decrease car use by building more public transit ridership and expanding biking infrastructure.

  • Harmful algal bloom confirmed in Riverside County
    A boat on a lake with green algae.
    A boat motors through green water during a harmful algal bloom in at Lake Elsinore, in 2022. Now another Riverside County lake, Lake Hemet, is reporting issues.

    Topline:

    Visitors and residents are being warned to avoid swimming in another Lake Hemet heading into the long Labor Day weekend.

    The details: State water officials confirmed a harmful algal bloom there is showing up as green, cloudy discolored water, scum and algae.

    What's next: You can check California’s map to see if any harmful algal blooms have been reported in the area.

    Topline:

    Visitors and residents are being warned to avoid swimming in another Southern California lake heading into the long Labor Day weekend.

    The details: State water officials confirmed a harmful algal bloom in Lake Hemet that’s showing up as green, cloudy discolored water, scum and algae.

    Why it matters: The bloom can produce toxins that could cause you and your furry friends to get sick. People and pets are being urged to stay out of the water and away from any scum or algae along the shore. Dogs and children are especially vulnerable because they’re more likely to swallow water while playing and swimming, according to the State Water Resources Control Board. You can learn more about healthy water habits here.

    Why now: The warning for the Riverside County lake comes about a week after a similar alert was issued for Big Bear Lake. Lake Hemet is under an advisory until further notice, state officials said.

    The backstory: Harmful algal blooms are most common in California between the warmer months of late May through October, although they can pop up year round, according to the board.

    What's next: You can check California’s map to see if any harmful algal blooms have been reported in the area.

    Go deeper: What's the green sheen on Big Bear Lake? What you need to know about harmful algal blooms

  • High quality affordable sushi and sake
    A man holds up a tuna head, as he goes through the process of cutting the fish, with an audience in attendance.
    Photo from Yama Sushi Marketplace's Koreatown grand opening

    Top line:

    Started by a local fish broker, Yama Sushi Marketplace has become a one-stop shop for Japanese culture. Current owner Scott Kohno talks about how they've grown the operation from San Gabriel to additional locations in Koreatown and West L.A.

    Expanding to craft sake: Co-owner Wendy Kohno, who is a professional sake sommelier, has helped add a selection of over 200 sake options.

    Upcoming event: Yama Sushi Marketplace is co-hosting American Craft Sake Fest, happening in West L.A., on Saturday, Sept.10.

    Read more... to learn how the business keeps the food quality high while keeping prices lower than you might think.

    Yama Sushi Marketplace is a local chain that helps set the standard for quality sushi and Japanese cuisine in Los Angeles — all while trying to keep prices more affordable than you might expect.

    About the owners

    Kenzo Yamada opened the business in 1984 after working as a local fish broker. He eventually sold the business in 2021 to Scott Kohno and his family. Kohno sat down with Austin Cross, who hosts AirTalk every Friday, to explain how they've continued to deliver quality sushi and expand the business.

    Making Japanese culture accessible and affordable

    A man holds up a tuna head, as he goes through the process of cutting the fish, with an audience in attendance.
    Yama Sushi Marketplace's Koreatown grand opening.
    (
    Courtesy Alysia Rodriguez
    )

    Yama Sushi Marketplace looks to provide the best of both worlds — high-quality sushi lower costs — in serving customers.

    How do they do it? They've benefited from Yamada's connections, sourcing quality fish through trusted suppliers like Bluefiná. It also helps that it's not a restaurant, minimizing the overhead costs that come with staffing.

    Restaurant details

    • The Kohno family has expanded to West L.A. and Koreatown. A fourth location is set to open in Sherman Oaks, although its official opening date hasn’t been announced.
    • Co-owner Wendy Kohno has a background as a kikisake-shi — sake sommelier — and has helped build out the market’s selection of more than 200 sakes, most of which you can find at their San Gabriel and West L.A. locations.
    • They also have classes on sushi, sake and miso.

    What we tried

    • California Roll (their most popular menu item)
    • Bara Chirashi
    • Yama Deluxe Platter
    • Narumi Sake (Yama's own craft sake)

    Yama Sushi Marketplace is co-hosting American Craft Sake Fest on Saturday, Sept. 10. Click here for more details.

    How to visit

    • Address:
      • San Gabriel location — 911 W Las Tunas Dr., San Gabriel, CA 91776
      • West LA location — 11709 National Blvd, Los Angeles, CA 90064
      • Koreatown location — 3178 W. Olympic Blvd, Los Angeles, CA 90006
    • Hours: All three businesses are open every day from 11 a.m. to 8 p.m.
    • Cost: A six-piece California roll costs $7.39; sushi platters range from $49 to $114.95.

    What should we try next?

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