New satellite measurements of NOx air pollutants above major North American cities show that Los Angeles had the highest emissions but also the steepest declines.
When it comes to air quality, the products you use to smell nice or keep your kitchen clean could do just as much damage as the car you drive.NOx emissions have fallen at a rate of roughly 7% a year from 2006 to 2013 across most U.S. cities, Cohen said. Scientists had presumed there was a direct correlation between those emissions and NOx levels in the air. Any variations in the length of time“What we wanted to know is, is that assumption ... true?” Cohen said.
It “changed over the last decade, and it changed in really interesting ways,” Cohen said. “In some places the lifetime got longer, in some places it got shorter. In some places it did one and then the other.” The differences in NOx lifetimes in L.A. and elsewhere may be due in part to the particular chemical makeup of the atmospheres above each city, Cohen said.“What we can’t do is explain why some cities behave in one way and why in another,” Cohen said. “We think it’s because we don’t understand the organic molecules in those cities.”
When the scientists looked at the concentrations of NOx in each city’s air, New York reigned supreme in 2013, at 4.7 quadrillion molecules per square centimeter. Chicago was next, with 4.1 quadrillion; Los Angeles came in third, with 4 quadrillion.Los Angeles also had the greatest improvement in its concentrations over the study period, dropping by 45%, compared to about 40% for New York and Washington, D.C., and about 36% for Chicago.
Deutschland Neuesten Nachrichten, Deutschland Schlagzeilen
Similar News:Sie können auch ähnliche Nachrichten wie diese lesen, die wir aus anderen Nachrichtenquellen gesammelt haben.
Gay Men's Chorus of Los Angeles names its new music director and conductorFollowing a year of internal strife, the Gay Men's Chorus of Los Angeles looks for a fresh start with new music director Ernest H. Harrison.
Weiterlesen »
Artist Lauren Halsey Injects Afrofuturism into the Los Angeles Art WorldThis artist straddles South Central L.A. and George Clinton's Afrofuturist utopia.
Weiterlesen »
Shooting reported at high school in Los Angeles areaA shooting was reported Thursday morning at a high school in Santa Clarita near Los Angeles, authorities said.
Weiterlesen »
Shooting reported at high school in Los Angeles areaA shooting was reported Thursday morning at a high school in Santa Clarita near Los Angeles, authorities said. Deputies are at the scene at Saugus High School, about 35 miles north of downtown Los Angeles, the Los Angeles County Sheriff's Department said. Two nearby elementary schools were placed
Weiterlesen »
'Multiple victims' in school shooting near Los AngelesSeveral people were injured during a shooting at a Southern California high school and the gunman is in custody - authorities
Weiterlesen »