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SAN DIEGO (KGTV) — Nearly three-quarters of the students in San Diego County are currently learning from home, and those numbers don’t make a lot of sense to MIT professor Martin Bazant.Bazant is one of the creators of the COVID-19 Indoor Safety Guideline. The free online tool simulates the fluid dynamics of respiratory droplets in various kinds of rooms to show users the risk of different indoor environments.“If you run the numbers for a typical classroom, especially if the students and the teachers are wearing masks, then the amount of time in the room can be very significant,” Bazant said. “Essentially those people could spend a week in the classroom and not have a problem.”Bazant says the six-foot rule that has largely determined which businesses can stay open is overly simplistic. In some cases, he says the rule creates a false sense of security. In other situations, he says it causes the closure of businesses or schools that could safely operate.“If you place nursing home beds six feet apart in a shared room, they are absolutely not safe,” he said. But he said well-ventilated classrooms, with teachers and students in masks, are another story.“It's only the United States where we follow the six-foot rule. That's given by the CDC. The World Health Organization all along has been saying one meter, which is about three feet. If you simply followed the one-meter rule, all our schools would be open, as they are in most of the world right now,” he said.Bazant and his colleague John Bush said they set out to design a tool that would reveal the risk of transmission based on science, not guesswork.Users start by selecting a room type, like a classroom or an airplane. From there, they can control a wide array of variables to dial in the risk, like the room size, the ceiling height, and the ventilation and filtration systems.From there, users can further tune the model by human behavior. How many people are in the room? Are they whispering, shouting or singing? How many are wearing masks?Mask usage is a critical component, Bazant says. The model quickly reveals the challenges of maskless activities in rooms with poor ventilation. Put five people without masks in a 400 square foot room with closed windows, and it becomes unsafe after 33 minutes.Bazant says studies on super spreader events show in indoor environments, the distance from an infected person doesn’t matter. Infected droplets spread and mix throughout the room like second-hand smoke from a cigarette.But with masks trapping droplets and diverting them upwards like a chimney, an environment like an airplane could be safe for several hours, according to the model. With more than 95% of the passengers and crew wearing surgical masks, a Boeing 737 could support 200 people -- around full capacity depending on the configuration -- for 18 hours. 2850

SAN DIEGO (KGTV) — Neighbors woke up to find disturbing graffiti in their Hillcrest neighborhood.For Lauren Matley, it was hard to hold back tears, as she scraped away the red paint on her car window. This was just one of many vehicles that were painted on along 6th Avenue in Hillcrest. Someone also painted on the side of houses and on a garage.Doctor Barry Kaplan was walking his dog when he noticed the graffiti and he called police. "Several of my grandparents died in the Holocaust. So, for me to see this, this reminds me of Nazi Germany. It’s very offensive," Kaplan said.Though Matley doesn’t know if this was a random act or meant to be antisemitic, she says it hits too close to home being a member of the Jewish community."You wake up and this is what you look forward to? The black community would look forward to? The Jewish community would look forward to? The Muslim community looks forward to?" Matley said.Police say after the reports are written this case will be handed to an investigator. From there it may get handed over to the District Attorney’s Office to determine if this was a hate crime. 1124

SAN DIEGO (KGTV) — Northbound lanes of Interstate 5 through National City were shut down early Saturday following a deadly crash.The two-vehicle collision occurred just after the State Route 54 connector, according to California Highway Patrol. All traffic was being diverted off I-5 at the Mile of Cars. Traffic was also being diverted off WB SR-54 onto Highland Ave.Traffic gridlocked in the area, backing up onto the E St. on ramp in Chula Vista and westbound Sr-54 connector, according to CHP. Some motorists were seen turning around on the on ramp and driving the wrong direction.MAP: LIVE TRAFFIC CONDITIONSCHP reported that all NB I-5 lanes were reopened just before 11 a.m.The cause of the crash is being investigated. But CHP said it appeared a Toyota Tacoma was speeding in the emergency lane to get around traffic and caused a chain-reaction crash involving at least four vehicles.That suspected driver of that truck reportedly took off after causing the crash, CHP said. Officers were searching for that driver Saturday morning.One person died in the multi-vehicle crash. That person has not been identified. 1128

SAN DIEGO (KGTV) - On Normal Street in Hillcrest Friday, things were anything but normal.   Tim Henderson and his colleagues were checking email in the street."Just a minute ago, we had a meeting out here," he says while pointing to an assortment of chairs.    He and his co-workers at KTUA, a landscape architecture and planning firm, set up a little home office in a spot usually occupied by 3 to 4 parked cars.   The space was decorated with plants and patio furniture.Welcome to “Park(ing) Day 2017,” billed as a worldwide event where artists and designers transform metered parking spots into temporary public parks.    The event ran Friday from 9AM – 3PM, with several downtown businesses also taking park."We're in a ‘car-centric’ world, we always have to supply places for cars,” Tim explained.  “We're making a statement: during some part of the year, you can come out into a space not  being used for cars -- and have a park!"Henderson and his work buddies barbecued in the parking spots and even roasted s’mores.Parking is at a premium in Hillcrest, but Henderson said nobody seemed to mind them taking up the spots.    In fact, he said drivers had been slowing down to catch a glimpse at the “front yard” they created on the street.“They love it,” he said. 1351

SAN DIEGO (KGTV) — Ocean Beach residents say they are uniting to address issues they believe stem from people living in vehicles.OB resident Michael Copley and nearly 100 others emailed San Diego Police this week, asking for officers to step up patrols in their neighborhood. "I'm just a citizen. I have no authority, I can't enforce anything," Michael Copley says. "But I was asking [police], 'please we want police presence in Ocean Beach.'"RELATED: Red curb in Ocean Beach is a fake fire zone, City of San Diego saysCopley says the large number of people living out of their vehicles in the neighborhood are fueling several community issues like vandalism and the prevalence of drugs. In a response posted to social media by SDPD officer David Surwilo, Surwilo says the concerns have been sent to patrol supervisors so that they "are aware of your community safety issues, what you are seeing and dealing with and your requests for assistance to address these issues."SDPD Capt. Scott Wahl adds, "We are out in the Ocean Beach area, seven days a week, making sure that we are addressing these issues. And it's important that the community continues to provide that information to us."The post referenced complaints pertaining to areas of Ocean Beach, Robb Field, and dog beach over vehicle campers, drug use, homelessness, and quality of life."One person sleeping in their car is not a big deal. But 100 people sleeping in their vans, that creates an impact on the community," Copley said.In May, city leaders approved restrictions on people living in their vehicles within San Diego. Part of those restriction prevent people from sleeping in vehicles within 500 feet of a school or home and overnight anywhere in the city from 9 p.m. to 6 a.m.Wahl says that now, the city has more beds and parking lots available for free to those living in vehicles that can help alleviate the concerns. But according to a July report by 10News, one of the city's newest parking lots for those individuals is going largely unused.Police recommend residents report non-emergency issues on the city's Get It Done mobile app. But if it is an emergency, residents are encouraged to call the police. 2190