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SAN DIEGO (KGTV) -- Authorities are investigating a man's death after they say he died following a fight. Police were called to the 5600 block of Imperial Avenue in Valencia Park around 1:12 p.m. after receiving reports of a man having chest pains. After arriving, the 51-year-old man -- identified as San Diego resident Joseph Ives -- was taken to the hospital where he later died.Police later learned that Ives got into a fight shortly before his death. According to police, after an altercation with another man, Ives told a witness that he was experiencing chest pains. Ives "did not have any obvious signs of trauma to his body," police said. Out of caution, San Diego Police homicide detectives are investigating the death.  773

SAN DIEGO (KGTV) — As temperatures warm up, there is some early research suggesting air conditioning units could increase the risk of spreading COVID-19.One team of researchers swabbed several kinds of air conditioning units and found traces of the virus on one out of every four samples.One of the authors, University of Oregon professor Dr. Kevin Van Den Wymelenberg, said the research “does give us some pause.”Air conditioning units bring in little outside air, particularly when temperatures are very hot, posing a risk that viral particles could be recirculated into rooms, Van Den Wymelenberg said.However, just because the study found traces of the virus in A/C units, it doesn’t prove people can actually get sick from the contaminated air because it’s not yet clear how many viral particles it takes to infect someone, he noted.“Nobody knows what that minimum threshold is so we need to take as many precautions as possible,” he said.Dr. Edward Nardell, a professor in the Departments of Environmental Health and Immunology and Infectious Diseases at the Harvard T.H. Chan School of Public Health, said air conditioning units can generate air currents that can carry large particles farther, similar to what researchers found contributed to the spread of the novel coronavirus disease in an air-conditioned restaurant in Guangzhou, China."You are not socially distanced as much, but you're re-breathing the same air that someone else just exhaled," Nardell said. "We call it rebreathed air fraction, and if someone is infectious, often asymptomatic, you're going to be rebreathing their small particles."This week, a group of 239 scientists from 32 countries asked the World Health Organization to update its COVID-19 guidance to reflect that the virus is airborne.On Thursday, the WHO released updated guidance acknowledging that airborne transmission can’t be ruled out, but stopped short of confirming that the virus spreads through the air.Instead, the WHO said the virus primarily spreads through droplet transmission, where larger particles come out of an infected person’s mouth, then fall quickly to the ground or onto surfaces. In airborne transmission, the particles stay floating for a long time.“I think they’re underweighting the importance of this airborne route based on the best available information,” said UC Berkeley Professor Emeritus William Nazaroff, one of the signatories of the letter to the WHO.He said in a poorly ventilated room, particles might linger for 30 minutes to an hour.Scientists say one of the best ways to protect yourself is to open windows, to increase the circulation of fresh air.Scientists say upgraded air filters in AC units and standalone air purifiers could also help.Germicidal lamps may also be effective, Nardell said. The technology is almost 100 years old, and has been proven effective in protecting against tuberculosis infection.The lamps, which shine ultraviolet light, are set up to shine horizontally, high up in the room to kill floating pathogens.Nardell said the technology can be deployed cheaply and easily in a number of settings.Additional reporting by Lauren Rozyla at WFTS 3159

SAN DIEGO (KGTV) -- California Highway Patrol has identified the man who died after slamming into a tree on the Sea World Drive on-ramp Saturday. CHP says 26-year-old Jacob Eugene Arnell was killed when the Cadillac Escalade he was driving at a high rate of speed overturned and hit a tree. The crash happened around 9 a.m. Saturday on the right shoulder of Sea World Drive. Arnell was pronounced dead at the scene. At this time, it’s unknown if drugs or alcohol were involved. The medical examiner’s toxicology report in pending, CHP says. Arnell was the only one inside the vehicle at the time of the crash. 618

SAN DIEGO (KGTV) — Birch Aquarium has opened a new exhibit showcasing one of the sea's most beautiful creatures in one of the world's largest habitats for the animal.The aquarium's new permanent exhibition "Seadragons and Seahorses" featuring Weedy and Leafy seadragons and several species of seahorses and pipefish.At the center of the exhibit will sit one of the world's largest seadragon habitats in the world, measuring 18 feet wide, 9 feet tall and containing 5,375 gallons of water, according to the aquarium.The exhibit takes guests into the lives of seadragons and seahorses, showcasing the sea life in a habitat designed to create the ideal environment for them to breed. Guests will learn how to observe the animals like scientists, catch distinguishing features, and identify courting and mating behaviors.The exhibit also gives visitors a peek into the Birch Aquariums Husbandry Team working to ensure the species thrives. Access to the exhibit is included with admission, which is .50 for adults and for children 3 - 17 years old. For more information on the exhibit, visit the aquarium's website. 1125

SAN DIEGO (KGTV) -- Caltrans is warning commuters about an overnight closure on State Route 54 Thursday. According to the agency, crews will close the westbound SR-54 connector to northbound and southbound I-805 between 11 p.m. Thursday and 5 a.m. Friday. The connector will be closed so crews can complete maintenance on guardrails.Signs will be posted directing drivers to exit at Highland Avenue, turn left to eastbound SR-54 to northbound or southbound I-805. 472