Air Visibility in our Sierra Nevada
Posted: Sun Oct 29, 2006 10:55 am
One of the major problems with photography on western slopes of the Sierra Nevada has become air polution over our great Cental Valley. Of course photography is rather low on the list of ills of air pollution to our society however it is the one I personally butt up against most regularly in my own life. Far more important to all of us are issues of health to ourselves and the environment. In my lifetime of several decades, I've personally noticed what seems to be regularly increasing dirtier air in the valley which is simply the result of growth of many more people, more vehicles, more agricultural, more industry. ...David
Here is a brief primer on this current situation:
http://www.valleyair.org/newsed/ca_prim ... /IIIA.html
These days one is unlikely to experience good alpenglow along the western peaks unless one times their visits to the mountains to the day or two following either one of our infrequent northerly fronts pushing across the state clearing out all the poluted stale air or major monsoonal flow up from the southeast that is strong enough to push into the central valley causing showers even there that clears out polutants. Many of us have been to such icon locations as Glacier Point in Yosemite or Moro Rock in Sequoia and been dismayed to experience considerable dimming of the warm red rays well before sunset that considerably decreases the resulting natural experience.
Below is a related story of the sad condition of our air as seen in our beloved mountains:
http://www.latimes.com/travel/outdoors/ ... acifictime
Fortuantely today in the internet age there are continually more resources coming on line all the time that provide information, often live, like never before. That has especially been the case for weather information with the below more narrowly relating some air quality web resources I will check. Thus when my interest is in capturing finer light, I may take a look at NWS forecast discussions, zone forecasts, satelite images, and air quality maps and forecasts.
The following contains some basics about natural light scattering and that by pollutants.
http://www.valleyair.org/newsed/ca_prim ... IIA5a.html
The below link chart that shows air quality between 10/21 and 10/27 is instructional because when I was driving home on 10/25 winds were blowing from the northwest most strongly causing lots of dust in the air. In fact it was one of the windiest days in the San Joaquin Valley all year. These sites that record the PM10 larger particulate matter showpeaks on that day indicating most of the visual polution was indeed just blowing dust.
http://www.valleyair.org/aqinfo/d-PM.htm
This map below is for smaller particles that also effect air clarity but are not so much due to dust but rather things like smoke are vehicle exaust. Notice how the windy weather on 10/25 actually reduced that polutant thus it is really only the PM10 pollutants that effected the very low air clarity that day:
http://airnow.gov/index.cfm?action=jump.jump_particle
These two web pages explain some of the polution terms like PM10:
http://airnow.gov/index.cfm?action=static.aqi
http://airnow.gov/index.cfm?action=jump.jump_particle
And this web page below is one indication the government does have people employed to work on the particle pollution problem just like the other air pollution issues:
http://www.wrapair.org/
http://www.davidsenesac.com
Here is a brief primer on this current situation:
http://www.valleyair.org/newsed/ca_prim ... /IIIA.html
These days one is unlikely to experience good alpenglow along the western peaks unless one times their visits to the mountains to the day or two following either one of our infrequent northerly fronts pushing across the state clearing out all the poluted stale air or major monsoonal flow up from the southeast that is strong enough to push into the central valley causing showers even there that clears out polutants. Many of us have been to such icon locations as Glacier Point in Yosemite or Moro Rock in Sequoia and been dismayed to experience considerable dimming of the warm red rays well before sunset that considerably decreases the resulting natural experience.
Below is a related story of the sad condition of our air as seen in our beloved mountains:
http://www.latimes.com/travel/outdoors/ ... acifictime
Fortuantely today in the internet age there are continually more resources coming on line all the time that provide information, often live, like never before. That has especially been the case for weather information with the below more narrowly relating some air quality web resources I will check. Thus when my interest is in capturing finer light, I may take a look at NWS forecast discussions, zone forecasts, satelite images, and air quality maps and forecasts.
The following contains some basics about natural light scattering and that by pollutants.
http://www.valleyair.org/newsed/ca_prim ... IIA5a.html
The below link chart that shows air quality between 10/21 and 10/27 is instructional because when I was driving home on 10/25 winds were blowing from the northwest most strongly causing lots of dust in the air. In fact it was one of the windiest days in the San Joaquin Valley all year. These sites that record the PM10 larger particulate matter showpeaks on that day indicating most of the visual polution was indeed just blowing dust.
http://www.valleyair.org/aqinfo/d-PM.htm
This map below is for smaller particles that also effect air clarity but are not so much due to dust but rather things like smoke are vehicle exaust. Notice how the windy weather on 10/25 actually reduced that polutant thus it is really only the PM10 pollutants that effected the very low air clarity that day:
http://airnow.gov/index.cfm?action=jump.jump_particle
These two web pages explain some of the polution terms like PM10:
http://airnow.gov/index.cfm?action=static.aqi
http://airnow.gov/index.cfm?action=jump.jump_particle
And this web page below is one indication the government does have people employed to work on the particle pollution problem just like the other air pollution issues:
http://www.wrapair.org/
http://www.davidsenesac.com