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Decades of underinvestment has left tens of thousands of schools across the country with inadequate ventilation systems, a problem that is now front and center in the debate to reopen schools during the pandemic.Nationally, 90 percent of schools fail to meet minimum ventilation standards. It’s an issue Dr. Joseph Allen has been sounding the alarm about since COVID-19 first shut down schools earlier this year.“We’ve chronically underinvested in our schools’ buildings,” said Dr. Allen who serves as the director of the Healthy Buildings program at the Harvard Chan School of Public Health.Dr. Allen and his colleagues have spent months analyzing school buildings, and back in June, they released a detailed 60-page report that school districts could follow in order to safely bring kids back into the classroom.In order to keep COVID-19 from spreading in schools, two things have to happen: everyone in the buildings must be wearing masks and school districts need to ensure buildings have proper ventilation, the report found.“If air is being recirculated and not filtered, all of that air that’s coming from one space and going to another could be potentially contaminated and spread the virus,” Dr. Allen said.But replacing decades-old ventilation systems that may not work properly is expensive and time-consuming. Because of that, Dr. Allen is recommending school districts also consider portable air cleaners for classrooms.Through his research, Dr. Allen found that if you can change the air in a classroom five times per hour, it cleans the air in that space every 12 minutes. However, the air cleaners must be equipped with a HEPPA filter in order to be effective.Even something as simple as opening windows could reduce the transmission of the virus.“If you look at the cases of spread in school right now, they all share common traits; it’s no mask-wearing and low to no ventilation. When we do that, we can guarantee there will be more cases,” he explained.Last week, the Healthy Buildings program also released a detailed portable air cleaner calculator. The tool allows school administrators to input the size of the classroom, even ceiling height, and then determine the kind of air cleaner that would most effectively keep COVID-19 from spreading.“It is critically important that we get kids back into in-person learning and we haven’t treated it as this national priority that it needs to be,” Dr. Allen added. 2438

DEL MAR (KGTV) - The Annual Pacific Classic Party celebrated heroes in the horse community who risked their lives to rescue thoroughbreds during the Lilac Fire."I want everybody who was at San Luis Ray that day to understand they were all heroes," Horse Trainer and Owner Kimberly Marrs said. She's owned horses as long as she can remember, and loves them with all her heart.Friday night, a jazz-infused, Hor d'oeuvres laden party at L'Auberge, the honorees transported attendees to smoke and flame-filled, frantic memories."His pen was on fire because he was in sawdust, literally drug him out of the pen," Marrs said, adding that on that day she lept inside and dragged the horse out, leading him and others along the way to the infield with another worker. They were almost to the end of the tunnel when, "next thing we're facing is a 50-head herd of horses, coming straight at us. So all we could do is basically plaster ourselves against the wall and close our eyes and pray we didn't get hit because if we got hit, we would've been knocked down and trampled to death."She made it unscathed and headed back for her barn where she knew another horse was waiting. When she returned, she faced devastation."I'm still looking for a hose to try and put him out, like I can save him. I tried to get in my barn, but it was so hot, I was stepping over flames," she said. Marrs knew he was already dead. She described it as a horrible, guilt-filled moment. For months, she the memoriy stayed with her.Friday night, that memory was brought into the light, by the horse community. They honored hers and so many others' stories of sacrifice.Noting Martine Bellocq in particular. Bellocq suffered burns to more than 60 percent of her body trying to rescue horses from the Lilac Fire. Saturday, after the third race, Bellocq will be honored for her role in rescuing the horses. 1961

DESCANSO (KGTV) -- A San Diego County couple is warning others after getting a flat tire from an unusual source. Pamela Jessup was running errands last Thursday morning when she says she started hearing a thumping noise while driving her Toyota RAV4 on SR-79 near Old Highway 80.Jessup says it was then that she pulled over and looked at her back tire. After not seeing anything wrong, she went on her way.The thumping, however, only intensified after she drove onto Interstate 8. When she drove home, Jessup says her husband Davis found a temporary lane marker stuck, nailed in to the tire.While doing their due diligence, the Descanso residents found dozens of temporary nail markers along the side of the road in the same area Jessup ran into issues.A local tire shop was able to fix the damage to the tire, but it cost the pair . Other residents in the area took to social media to complain similar events that happened to them in the same area.On Facebook, at least three others said they also got flat tires after driving through the area.From Tuesday through Friday, neighbors reported a road construction project that included restriping.On 10News at 5, we follow David Jessup as he makes the journey to the Caltrans subcontractor for answers and to give them back their lane markers. 1313

Days after NASCAR's only African American driver drove a car with a Black Lives Matter paint scheme, a second racer drove a car with a pro-police paint scheme.Kyler Weatherman drove a car adorned with a "Thin Blue Line" flag — a black-and-white American flag with one blue stripe — and the hashtag #BackTheBlue during Sunday's Dixie Vodka 400.While Weatherman's car did specifically mention the "Blue Lives Matter" movement, the "Thin Blue Line" flag is used as an emblem by the organization.Blue Lives Matter is a pro-police group. Critics say the group's formation directly countered the Black Lives Matter movement. 626

DEL MAR, Calif. (KGTV) -- Train traffic in Del Mar was stopped Wednesday, after a cliff collapse near 11th Street. It was a beautiful afternoon for sun and surf until the earth came tumbling down. Del Mar resident, Ingrid Hoffmeister has seen it for years - the cliffs in front of her home, slowly disappearing.“We all know it’s happening, so it’s not a surprise," Hoffmeister said. “It’s getting closer and closer to the path of where you’re walking.”Around 4:30 p.m. Wednesday, plumes of dust filled the air, as enormous chunks of the Del Mar cliffs came crumbling down onto the beach. A 10News Insagram follower sent this video of the fall:  672