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Freezing Fog Advisory


URGENT - WEATHER MESSAGE
National Weather Service Pendleton OR
902 AM PST Sun Dec 10 2017

...STAGNANT AIR CONDITIONS CONTINUE THROUGH THURSDAY...

...AREAS OF DENSE FREEZING FOG FOR THE FOOTHILLS OF THE SOUTHERN
BLUE MOUNTAINS AND PORTIONS OF NORTH CENTRAL AND CENTRAL OREGON
UNTIL NOON MONDAY...

.An upper level ridge will persist over the Pacific Northwest.
This ridge will cause air movement to be limited over portions of
the region. Areas of freezing fog will be possible and the air
quality will become unhealthy at times.

ORZ510-110700-
/O.EXT.KPDT.ZF.Y.0013.000000T0000Z-171211T2000Z/
/O.CON.KPDT.AS.Y.0003.000000T0000Z-171214T1800Z/
North Central Oregon-
including the cities of Dufur and Maupin
902 AM PST Sun Dec 10 2017

...FREEZING FOG ADVISORY NOW IN EFFECT UNTIL NOON PST MONDAY...
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST
THURSDAY...

* AIR QUALITY...Moderate to unhealthy.

* VISIBILITIES...One quarter mile or less at times.

* TIMING...Areas of freezing fog through Monday morning. Stagnant
  air to persist for several more days.

* IMPACTS...Persons with respiratory issues should follow the
  advice of their physician on how to deal with poor air
  quality. Also outdoor burning may be limited, so please
  consult with your local burn agencies. Motorists should be
  prepared for sudden changes in visibility. Also roadways and
  sidewalks may become slippery due to fog freezing on surfaces.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Freezing Fog Advisory means visibilities will frequently be
reduced to less than one quarter mile. If driving...slow down...
use your headlights...and leave plenty of distance ahead of you.
Also...be alert for frost on bridge decks causing slippery roads.

An Air Stagnation Advisory indicates that due to limited movement
of an air mass across the advisory area...pollution has the
potential to increase to dangerous levels. Persons with
respiratory illness should follow their physicians advice for
dealing with high levels of air pollution.

During periods of stagnant air...state air quality agencies
highly recommend that no outdoor burning occur and that
residential wood burning devices be limited as much as possible.
According to state air quality agencies...prolonged periods of
stagnant air can hold pollutants close to the ground...where
people live and breathe. Check with your local burn agency for
any current restrictions in your area.

&&

$$

URGENT - WEATHER MESSAGE
National Weather Service Pendleton OR
902 AM PST Sun Dec 10 2017

...STAGNANT AIR CONDITIONS CONTINUE THROUGH THURSDAY...

...AREAS OF DENSE FREEZING FOG FOR THE FOOTHILLS OF THE SOUTHERN
BLUE MOUNTAINS AND PORTIONS OF NORTH CENTRAL AND CENTRAL OREGON
UNTIL NOON MONDAY...

.An upper level ridge will persist over the Pacific Northwest.
This ridge will cause air movement to be limited over portions of
the region. Areas of freezing fog will be possible and the air
quality will become unhealthy at times.

ORZ511-110700-
/O.EXT.KPDT.ZF.Y.0013.000000T0000Z-171211T2000Z/
/O.CON.KPDT.AS.Y.0003.000000T0000Z-171212T2000Z/
Central Oregon-
including the cities of Bend, Madras, Prineville, and Redmond
902 AM PST Sun Dec 10 2017

...FREEZING FOG ADVISORY NOW IN EFFECT UNTIL NOON PST MONDAY...
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL NOON PST
TUESDAY...

* AIR QUALITY...Moderate to unhealthy.

* VISIBILITIES...Less than a quarter of a mile at time.

* TIMING...Areas of freezing fog through Monday morning. Stagnant
  air to persist for several more days.

* IMPACTS...Persons with respiratory issues should follow the
  advice of their physician on how to deal with poor air
  quality. Also outdoor burning may be limited, so please
  consult with your local burn agencies. Motorists should be
  prepared for sudden changes in visibility. Also roadways and
  sidewalks may become slippery due to fog freezing on surfaces.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Freezing Fog Advisory means visibilities will frequently be
reduced to less than one quarter mile. If driving...slow down...
use your headlights...and leave plenty of distance ahead of you.
Also...be alert for frost on bridge decks causing slippery roads.

An Air Stagnation Advisory indicates that due to limited movement
of an air mass across the advisory area...pollution has the
potential to increase to dangerous levels. Persons with
respiratory illness should follow their physicians advice for
dealing with high levels of air pollution.

During periods of stagnant air...state air quality agencies
highly recommend that no outdoor burning occur and that
residential wood burning devices be limited as much as possible.
According to state air quality agencies...prolonged periods of
stagnant air can hold pollutants close to the ground...where
people live and breathe. Check with your local burn agency for
any current restrictions in your area.

&&

$$

URGENT - WEATHER MESSAGE
National Weather Service Pendleton OR
902 AM PST Sun Dec 10 2017

...STAGNANT AIR CONDITIONS CONTINUE THROUGH THURSDAY...

...AREAS OF DENSE FREEZING FOG FOR THE FOOTHILLS OF THE SOUTHERN
BLUE MOUNTAINS AND PORTIONS OF NORTH CENTRAL AND CENTRAL OREGON
UNTIL NOON MONDAY...

.An upper level ridge will persist over the Pacific Northwest.
This ridge will cause air movement to be limited over portions of
the region. Areas of freezing fog will be possible and the air
quality will become unhealthy at times.

ORZ508-110700-
/O.EXT.KPDT.ZF.Y.0013.000000T0000Z-171211T2000Z/
/O.CON.KPDT.AS.Y.0003.000000T0000Z-171214T1800Z/
Foothills of the Southern Blue Mountains of Oregon-
including the cities of Heppner, Condon, and Fossil
902 AM PST Sun Dec 10 2017

...FREEZING FOG ADVISORY NOW IN EFFECT UNTIL NOON PST MONDAY...
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST
THURSDAY...

* AIR QUALITY...Moderate to unhealthy.

* VISIBILITIES...One quarter mile or less at times.

* TIMING...Freezing fog through Monday morning...especially above
  2000 feet. Stagnant air to persist for several more days

* IMPACTS...Persons with respiratory issues should follow the
  advice of their physician on how to deal with poor air
  quality. Also outdoor burning may be limited, so please
  consult with your local burn agencies. Motorists should be
  prepared for sudden changes in visibility. Also roadways and
  sidewalks may become slippery due to fog freezing on surfaces.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Freezing Fog Advisory means visibilities will frequently be
reduced to less than one quarter mile. If driving...slow down...
use your headlights...and leave plenty of distance ahead of you.
Also...be alert for frost on bridge decks causing slippery roads.

An Air Stagnation Advisory indicates that due to limited movement
of an air mass across the advisory area...pollution has the
potential to increase to dangerous levels. Persons with
respiratory illness should follow their physicians advice for
dealing with high levels of air pollution.

During periods of stagnant air...state air quality agencies
highly recommend that no outdoor burning occur and that
residential wood burning devices be limited as much as possible.
According to state air quality agencies...prolonged periods of
stagnant air can hold pollutants close to the ground...where
people live and breathe. Check with your local burn agency for
any current restrictions in your area.

&&

$$


Air Quality Alert


ORC001-025-045-112115-
Baker-Harney-Malheur-
156 PM MST Sun Dec 10 2017 /1256 PM PST Sun Dec 10 2017/

...AIR QUALITY ADVISORY FROM THE OREGON DEPARTMENT OF ENVIRONMENTAL
QUALITY FOR NORTHERN HARNEY COUNTY, THE LOWER TREASURE VALLEY OF
OREGON AND THE BAKER VALLEY...

The Oregon Department of Environmental Quality has issued an Air
Quality Advisory for Northern Harney County, the Lower Treasure
Valley of Oregon and the Baker Valley due to elevated
pollutant levels. This Advisory will remain in effect until air
quality conditions have significantly improved.

Inversion conditions are expected over the area, with light winds
and limited mixing of the air.  During these conditions, smoke can
be trapped at ground level and potentially build up in concentration
for the duration of the stagnant air pattern.

DEQ asks people in the affected areas to refrain from outdoor
burning and to use alternatives to wood stoves if other heating
options are available and practical.  Information on wood stoves,
and wood stove smoke, can be found at:
http://www.oregon.gov/deq/Residential/Pages/Woodstoves-Health.aspx.
Be sure to check for any local burning restrictions or wood stove
advisories in each particular community before burning.

Exposure to ambient particulate matter pollution is one of the top
risk factors that contribute to premature death in the United
States, accounting for approximately 100,000 deaths annually.
Numerous scientific studies have linked smoke pollution to a variety
of problems including coughing, aggravated asthma, bronchitis, and
irregular heartbeat.

Health officials recommend that young children, pregnant women,
asthma suffers, those with lung or heart conditions, and adults age
65 and older limit vigorous outdoor activity.  Pollution levels tend
to be highest during morning and evening hours.

Visit the Oregon DEQ internet site at
http://www.deq.state.or.us/aqi/ for current conditions.

$$


Air Stagnation Advisory


URGENT - WEATHER MESSAGE
National Weather Service Seattle WA
309 PM PST Sun Dec 10 2017

WAZ503-504-506-507-509>511-514-555-556-558-559-111400-
/O.CON.KSEW.AS.Y.0001.000000T0000Z-171211T2000Z/
Western Whatcom County-Southwest Interior-Western Skagit County-
Everett and Vicinity-Tacoma Area-Admiralty Inlet Area-
Hood Canal Area-Eastern Strait of Juan de Fuca-
East Puget Sound Lowlands-Bellevue and Vicinity-
Seattle and Vicinity-Bremerton and Vicinity-
309 PM PST Sun Dec 10 2017

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL NOON PST
MONDAY...

* AIR QUALITY...Dry conditions, light winds and poor mixing has
  lead to stagnant conditions in the interior lowlands. Stagnant
  conditions will trap pollutants near the surface which will
  lead to deteriorating air quality.

* TIMING...Through Monday morning.

* MAIN IMPACT...Deteriorating air quality may affect people with
  respiratory issues. Check with your local clean air agencies
  for possible burn bans.

  nwcleanairwa.gov
  www.orcaa.org
  www.pscleanair.org
  www.swcleanair.org
  www.ecy.wa.gov

PRECAUTIONARY/PREPAREDNESS ACTIONS...

An Air Stagnation Advisory indicates that due to limited movement
of an air mass across the advisory area...pollution will increase
to dangerous levels. Persons with respiratory illness should
follow their physicians advice for dealing with high levels of
air pollution.

&&

$$

www.weather.gov/seattle

URGENT - WEATHER MESSAGE
National Weather Service Medford OR
218 PM PST Sun Dec 10 2017

ORZ029>031-111815-
/O.CON.KMFR.AS.Y.0005.000000T0000Z-171214T2200Z/
Klamath Basin-
Northern and Eastern Klamath County and Western Lake County-
Central and Eastern Lake County-
Including the cities of Altamont, Klamath Falls, Beatty, Bly,
Crescent, Gilchrist, Sprague River, Adel, and Lakeview
218 PM PST Sun Dec 10 2017

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 2 PM PST
THURSDAY...

* Air stagnation locations include: All inland valleys.

* Impacts: Limited ventilation will result in degraded air
  quality, which may pose a risk to those working outside and to
  those with sensitive health issues.

* View the hazard area in detail at
  https://www.wrh.noaa.gov/mfr/HAZARD

Precautionary/preparedness actions...

An air stagnation advisory indicates that due to limited movement
of an air mass across the advisory area, pollution will increase.

&&

$$

URGENT - WEATHER MESSAGE
National Weather Service Spokane WA
1114 AM PST Sun Dec 10 2017

...STAGNANT AIR CONDITIONS EXPECTED THROUGH THURSDAY...

Strong high pressure over the region will create a persistent
inversion trapping pollution near the surface and producing the
potential for deteriorating air quality.

IDC009-017-021-035-049-055-057-061-069-079-WAC001-003-007-017-019-
023-025-043-047-051-063-065-075-112000-
/O.CON.KOTX.AS.Y.0003.000000T0000Z-171214T2000Z/
Benewah-Bonner-Boundary-Clearwater-Idaho-Kootenai-Latah-Lewis-
Nez Perce-Shoshone-Adams-Asotin-Chelan-Douglas-Ferry-Garfield-
Grant-Lincoln-Okanogan-Pend Oreille-Spokane-Stevens-Whitman-
1114 AM PST Sun Dec 10 2017 /1214 PM MST Sun Dec 10 2017/

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL NOON PST /1 PM
MST/ THURSDAY...

* Air Quality...Pollutants may increase this week. Regional air
  quality sensors range from good to moderate however as
  pollutants increase...deteriorating air quality will be
  possible.

* Impacts...Persons with respiratory issues should follow the
  advice of their physician on how to deal with poor air
  quality. Outdoor burning may be limited, so please consult
  with your local burn agencies for updated burn restrictions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

An Air Stagnation Advisory indicates that due to limited movement
of an air mass across the advisory area...pollution may increase
to unhealthy levels. Persons with respiratory illness should
follow their physicians advice for dealing with high levels of
air pollution.

&&

$$

URGENT - WEATHER MESSAGE
National Weather Service Pendleton OR
902 AM PST Sun Dec 10 2017

...STAGNANT AIR CONDITIONS CONTINUE THROUGH THURSDAY...

...AREAS OF DENSE FREEZING FOG FOR THE FOOTHILLS OF THE SOUTHERN
BLUE MOUNTAINS AND PORTIONS OF NORTH CENTRAL AND CENTRAL OREGON
UNTIL NOON MONDAY...

.An upper level ridge will persist over the Pacific Northwest.
This ridge will cause air movement to be limited over portions of
the region. Areas of freezing fog will be possible and the air
quality will become unhealthy at times.

ORZ041-044-505-507-WAZ024-026>029-520-521-110700-
/O.CON.KPDT.AS.Y.0003.000000T0000Z-171214T1800Z/
East Columbia River Gorge-Lower Columbia Basin of Oregon-
John Day Basin-Foothills of the Northern Blue Mountains of Oregon-
Eastern Columbia River Gorge of Washington-Kittitas Valley-
Yakima Valley-Lower Columbia Basin of Washington-
Foothills of the Blue Mountains of Washington-
East Slopes of the Washington Cascades-Simcoe Highlands-
including the cities of Arlington, The Dalles, Boardman,
Hermiston, Ione, Dayville, John Day, Mitchell, Monument, Spray,
Pendleton, Pilot Rock, White Salmon, Ellensburg, Thorp, Naches,
Sunnyside, Toppenish, Yakima, Connell, Prosser, Tri-Cities,
Dayton, Waitsburg, Walla Walla, Appleton, Cle Elum, Cliffdell,
Goldendale, and Bickleton
902 AM PST Sun Dec 10 2017

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST
THURSDAY...

* AIR QUALITY...Moderate to unhealthy.

* TIMING...Stagnant air to persist for several more days.

* IMPACTS...Persons with respiratory issues should follow the
  advice of their physician on how to deal with poor air
  quality. Also outdoor burning may be limited, so please
  consult with your local burn agencies.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

An Air Stagnation Advisory indicates that due to limited movement
of an air mass across the advisory area...pollution has the
potential to increase to dangerous levels. Persons with
respiratory illness should follow their physicians advice for
dealing with high levels of air pollution.

During periods of stagnant air...state air quality agencies
highly recommend that no outdoor burning occur and that
residential wood burning devices be limited as much as possible.
According to state air quality agencies...prolonged periods of
stagnant air can hold pollutants close to the ground...where
people live and breathe. Check with your local burn agency for
any current restrictions in your area.

&&

$$

URGENT - WEATHER MESSAGE
National Weather Service Pendleton OR
902 AM PST Sun Dec 10 2017

...STAGNANT AIR CONDITIONS CONTINUE THROUGH THURSDAY...

...AREAS OF DENSE FREEZING FOG FOR THE FOOTHILLS OF THE SOUTHERN
BLUE MOUNTAINS AND PORTIONS OF NORTH CENTRAL AND CENTRAL OREGON
UNTIL NOON MONDAY...

.An upper level ridge will persist over the Pacific Northwest.
This ridge will cause air movement to be limited over portions of
the region. Areas of freezing fog will be possible and the air
quality will become unhealthy at times.

ORZ509-110700-
/O.CON.KPDT.AS.Y.0003.000000T0000Z-171212T2000Z/
East Slopes of the Oregon Cascades-
including the cities of La Pine and Sunriver
902 AM PST Sun Dec 10 2017

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL NOON PST
TUESDAY...

* AIR QUALITY...Moderate to unhealthy.

* Elevation...Mainly below 4000 feet.

* IMPACTS...Persons with respiratory issues should follow the
  advice of their physician on how to deal with poor air
  quality. Also outdoor burning may be limited, so please
  consult with your local burn agencies.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

An Air Stagnation Advisory indicates that due to limited movement
of an air mass across the advisory area...pollution has the
potential to increase to dangerous levels. Persons with
respiratory illness should follow their physicians advice for
dealing with high levels of air pollution

During periods of stagnant air...state air quality agencies
highly recommend that no outdoor burning occur and that
residential wood burning devices be limited as much as possible.
According to state air quality agencies...prolonged periods of
stagnant air can hold pollutants close to the ground...where
people live and breathe. Check with your local burn agency for
any current restrictions in your area.

&&

$$

URGENT - WEATHER MESSAGE
National Weather Service Pendleton OR
902 AM PST Sun Dec 10 2017

...STAGNANT AIR CONDITIONS CONTINUE THROUGH THURSDAY...

...AREAS OF DENSE FREEZING FOG FOR THE FOOTHILLS OF THE SOUTHERN
BLUE MOUNTAINS AND PORTIONS OF NORTH CENTRAL AND CENTRAL OREGON
UNTIL NOON MONDAY...

.An upper level ridge will persist over the Pacific Northwest.
This ridge will cause air movement to be limited over portions of
the region. Areas of freezing fog will be possible and the air
quality will become unhealthy at times.

ORZ511-110700-
/O.EXT.KPDT.ZF.Y.0013.000000T0000Z-171211T2000Z/
/O.CON.KPDT.AS.Y.0003.000000T0000Z-171212T2000Z/
Central Oregon-
including the cities of Bend, Madras, Prineville, and Redmond
902 AM PST Sun Dec 10 2017

...FREEZING FOG ADVISORY NOW IN EFFECT UNTIL NOON PST MONDAY...
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL NOON PST
TUESDAY...

* AIR QUALITY...Moderate to unhealthy.

* VISIBILITIES...Less than a quarter of a mile at time.

* TIMING...Areas of freezing fog through Monday morning. Stagnant
  air to persist for several more days.

* IMPACTS...Persons with respiratory issues should follow the
  advice of their physician on how to deal with poor air
  quality. Also outdoor burning may be limited, so please
  consult with your local burn agencies. Motorists should be
  prepared for sudden changes in visibility. Also roadways and
  sidewalks may become slippery due to fog freezing on surfaces.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Freezing Fog Advisory means visibilities will frequently be
reduced to less than one quarter mile. If driving...slow down...
use your headlights...and leave plenty of distance ahead of you.
Also...be alert for frost on bridge decks causing slippery roads.

An Air Stagnation Advisory indicates that due to limited movement
of an air mass across the advisory area...pollution has the
potential to increase to dangerous levels. Persons with
respiratory illness should follow their physicians advice for
dealing with high levels of air pollution.

During periods of stagnant air...state air quality agencies
highly recommend that no outdoor burning occur and that
residential wood burning devices be limited as much as possible.
According to state air quality agencies...prolonged periods of
stagnant air can hold pollutants close to the ground...where
people live and breathe. Check with your local burn agency for
any current restrictions in your area.

&&

$$

URGENT - WEATHER MESSAGE
National Weather Service Pendleton OR
902 AM PST Sun Dec 10 2017

...STAGNANT AIR CONDITIONS CONTINUE THROUGH THURSDAY...

...AREAS OF DENSE FREEZING FOG FOR THE FOOTHILLS OF THE SOUTHERN
BLUE MOUNTAINS AND PORTIONS OF NORTH CENTRAL AND CENTRAL OREGON
UNTIL NOON MONDAY...

.An upper level ridge will persist over the Pacific Northwest.
This ridge will cause air movement to be limited over portions of
the region. Areas of freezing fog will be possible and the air
quality will become unhealthy at times.

ORZ508-110700-
/O.EXT.KPDT.ZF.Y.0013.000000T0000Z-171211T2000Z/
/O.CON.KPDT.AS.Y.0003.000000T0000Z-171214T1800Z/
Foothills of the Southern Blue Mountains of Oregon-
including the cities of Heppner, Condon, and Fossil
902 AM PST Sun Dec 10 2017

...FREEZING FOG ADVISORY NOW IN EFFECT UNTIL NOON PST MONDAY...
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST
THURSDAY...

* AIR QUALITY...Moderate to unhealthy.

* VISIBILITIES...One quarter mile or less at times.

* TIMING...Freezing fog through Monday morning...especially above
  2000 feet. Stagnant air to persist for several more days

* IMPACTS...Persons with respiratory issues should follow the
  advice of their physician on how to deal with poor air
  quality. Also outdoor burning may be limited, so please
  consult with your local burn agencies. Motorists should be
  prepared for sudden changes in visibility. Also roadways and
  sidewalks may become slippery due to fog freezing on surfaces.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Freezing Fog Advisory means visibilities will frequently be
reduced to less than one quarter mile. If driving...slow down...
use your headlights...and leave plenty of distance ahead of you.
Also...be alert for frost on bridge decks causing slippery roads.

An Air Stagnation Advisory indicates that due to limited movement
of an air mass across the advisory area...pollution has the
potential to increase to dangerous levels. Persons with
respiratory illness should follow their physicians advice for
dealing with high levels of air pollution.

During periods of stagnant air...state air quality agencies
highly recommend that no outdoor burning occur and that
residential wood burning devices be limited as much as possible.
According to state air quality agencies...prolonged periods of
stagnant air can hold pollutants close to the ground...where
people live and breathe. Check with your local burn agency for
any current restrictions in your area.

&&

$$

URGENT - WEATHER MESSAGE
National Weather Service Pendleton OR
902 AM PST Sun Dec 10 2017

...STAGNANT AIR CONDITIONS CONTINUE THROUGH THURSDAY...

...AREAS OF DENSE FREEZING FOG FOR THE FOOTHILLS OF THE SOUTHERN
BLUE MOUNTAINS AND PORTIONS OF NORTH CENTRAL AND CENTRAL OREGON
UNTIL NOON MONDAY...

.An upper level ridge will persist over the Pacific Northwest.
This ridge will cause air movement to be limited over portions of
the region. Areas of freezing fog will be possible and the air
quality will become unhealthy at times.

ORZ510-110700-
/O.EXT.KPDT.ZF.Y.0013.000000T0000Z-171211T2000Z/
/O.CON.KPDT.AS.Y.0003.000000T0000Z-171214T1800Z/
North Central Oregon-
including the cities of Dufur and Maupin
902 AM PST Sun Dec 10 2017

...FREEZING FOG ADVISORY NOW IN EFFECT UNTIL NOON PST MONDAY...
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST
THURSDAY...

* AIR QUALITY...Moderate to unhealthy.

* VISIBILITIES...One quarter mile or less at times.

* TIMING...Areas of freezing fog through Monday morning. Stagnant
  air to persist for several more days.

* IMPACTS...Persons with respiratory issues should follow the
  advice of their physician on how to deal with poor air
  quality. Also outdoor burning may be limited, so please
  consult with your local burn agencies. Motorists should be
  prepared for sudden changes in visibility. Also roadways and
  sidewalks may become slippery due to fog freezing on surfaces.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Freezing Fog Advisory means visibilities will frequently be
reduced to less than one quarter mile. If driving...slow down...
use your headlights...and leave plenty of distance ahead of you.
Also...be alert for frost on bridge decks causing slippery roads.

An Air Stagnation Advisory indicates that due to limited movement
of an air mass across the advisory area...pollution has the
potential to increase to dangerous levels. Persons with
respiratory illness should follow their physicians advice for
dealing with high levels of air pollution.

During periods of stagnant air...state air quality agencies
highly recommend that no outdoor burning occur and that
residential wood burning devices be limited as much as possible.
According to state air quality agencies...prolonged periods of
stagnant air can hold pollutants close to the ground...where
people live and breathe. Check with your local burn agency for
any current restrictions in your area.

&&

$$

U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: June 2, 2009
NATIONAL WEATHER SERVICE: for Safety, for Work, for Fun - FOR LIFE