Has air quality in Washington State gotten better or worse during the past 15 years? The answer: generally better except during wildfire smoke periods during the summer. Let me show you the data. I started at a wonderful web site run by the Puget Sound Clean Air Agency that allows one to plot all kinds of air quality indices. I plotted PM2.5 concentrations–the concentrations of particles below 2.5 microns (millionths of a meter). These particles are the kind that can move deep into your lungs, causing all kinds of problems. And high concentrations are associated with poor visibility. Here is the plot of maximum daily values in Seattle from August 2001 to yesterday. The vertical lines are on January 1st of each year. The first thing you notice is that August 2018 had the biggest peak on record (about 150)–that was the terribly smoky period of August 21-22. Next came the wildfire smoke period in 2017. Look closer and you will notice that earlier in the period, the worst air pollution was generally during the winter–often when we had high pressure and low-level inversions. The source of the pollutants were mainly from combustion (trucks, cars, ships) and wood-burning in stoves… Read full this story
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Is Washington State Air Quality Getting Better or Worse? have 299 words, post on cliffmass.blogspot.com at April 25, 2019. This is cached page on Talk Vietnam. If you want remove this page, please contact us.