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Zhu and Paulson found that when traffic dropped more than 90 percent on the closed 405, with only construction vehicles still on the move, ultrafine particles dropped by 83 percent. Exposure to near-roadway pollutants has been linked to increases in asthma, heart attacks, strokes, diabetes, low birth weight, pre-term births and other ailments, the researchers noted. PM2.5 can spread farther from the freeway and last longer than ultrafine particles, but both are pollutants with health risks. The researchers measured ultrafine particles (less than 0.1 microns in diameter), which are key indicators of real-time traffic levels, and also fine particulate matter known as "PM2.5" (less than 2.5 microns in diameter), which includes tailpipe emissions and new particles created when the emissions interact with the atmosphere. "We measured fresh emissions: pollutants that come directly from cars. "The effect was gone by the next week," Paulson said. But to get a regional effect, the researchers said, you need a regional drop in traffic, like what Los Angeles saw during the first Carmageddon - and it doesn't last if traffic returns. The research gives a peek at what the air would look like in a healthier Los Angeles with a vast majority of hybrid and electric vehicles and shows how quickly less driving can improve key measures of air quality.
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It was a really eye-opening glimpse of what the future could be like if we can move away from combustion engines." "Our measurements in Santa Monica were almost below what our instruments could detect, and the regional effect was significant. "The air was amazingly clean that weekend," Paulson said.
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While the researchers expected cleaner air, they didn't expect the improvement to be so dramatic. The study was led by two professors at UCLA's Institute of the Environment and Sustainability: Yifang Zhu, who is also an associate professor of environmental health sciences at the UCLA Fielding School of Public Health, and Suzanne Paulson, who is also a professor of atmospheric and oceanic sciences. 28, UCLA researchers report that they measured air pollutants during last year's Carmageddon (July 15-17) and found that when 10 miles of the 405 closed, air quality near the shuttered portion improved within minutes, reaching levels 83 percent better than on comparable weekends.īecause traffic dipped all over Southern California that weekend, air quality also improved 75 percent in parts of West Los Angeles and Santa Monica and an average of 25 percent regionally - from Ventura to Yucaipa, and Long Beach to Santa Clarita. Live in LA? What are your plans for the weekend? Will you find alternative fun to pass the time like Artmageddon, or will you ignore Anderson's request and take to the skies? Drop us a line or leave a note in the comments below.In study findings announced Sept. While news crews will undoubtedly be on hand for the event, Sherman Oaks board director Bob Anderson has demanded that well-heeled gawkers "stop having wine and cheese parties on helicopters to watch the bridge come down." Congressman Howard Berman (D-Valley Village) proposed the Los Angeles Residential Helicopter Noise Relief Act, which would have allowed the Federal Aviation Administration to set rules governing flight paths for helicopter operators in LA.Īlas, Berman's bill seems to have stalled, so officials are now asking insisting that helicopter pilots be considerate and reasonable over the weekend. In fact, the situation was so bad that U.S. However, some who live near the soon-to-be-closed interstate have a new concern: traffic jams overhead.Īccording to the LA Times, there was one under-reported hitch in last year's Carmageddon: swarms of sightseers hovering in helicopters above the Westside neighborhood to catch a glimpse of the Mulholland Bridge's destruction. But they're going to get the chance to break the 405 habit once more this weekend.įrom 7pm today until 5am Monday, the same ten-mile stretch of the 405 will be shut down as construction teams - you guessed it - demolish the north side of the Mulholland Bridge so that it can be rebuilt wider and more seismically sound.Ĭity officials are hoping that Carmageddon II - which we affectionately dubbed "Carmageddon 2: Revenge of the Fallen: This Time, It's Electric Boogaloo (featuring Patty Smyth)" - will go as smoothly as the first one. LA being LA, residents quickly resumed their auto-centric habits as soon as Carmageddon wrapped up (17 hours ahead of schedule, thank you very much).