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Air Quality Action Day has been declared for Dec 1

A(n) Air Quality Action Day has been declared for Susquehanna Valley, PA, on Saturday, Dec 1
Tomorrow’s Forecast
Saturday, Dec 1: 110 AQI Unhealthy for Sensitive Groups Particle Pollution (2.5 microns)

Extended Forecast
Sunday, Dec 2: 100 AQI Moderate Particle Pollution (2.5 microns)
Monday, Dec 3: 65 AQI Moderate Particle Pollution (2.5 microns)
Current conditions as of 1 PM on Friday:  Much of the Commonwealth is caught in a zone in between two areas of high pressure this Friday, resulting in nearly calm winds with a layer of clouds draped across the region.  An increase in warmer air and moisture this weekend will also contribute to an increase in PM 2.5 levels in an already modified air mass.  Concentrations are expected to peak on Saturday, with slow improvement throughout the remainder of the weekend and into early next week.  A strong cold front will push through the region by the middle of the week to provide good air quality conditions once again.  *** Saturday’s Forecast:  The area of high pressure situated to our north on Friday will become the dominant feature on Saturday.  This high sitting north of us will create a light easterly flow at the surface.  This easterly flow will work to trap some colder air at the surface, forcing temperatures to struggle to reach the mid 40s if not remaining colder.  Winds aloft will continue to be more southwesterly as warmer air begins to push northward over the region.  The warmer air overrunning a shallow pocket of colder air at the surface will create a temperature inversion to trap pollutants near the surface.  Skies will remain mostly cloudy throughout the day.  Easterly flow typically will bring cleaner air into the region.  With the easterly flow near the surface expected to be so light, it will take until late in the day to see much of an impact should this occur.  The flow from the east will also cause particles to become trapped on the east side of the Appalachian Mountains, especially when some warmer air aloft creates a temperature inversion.  As a result, PM 2.5 levels that were already in the high moderate range on Friday are expected to climb into the lower end of the Code Orange range.  These higher concentrations will spill over into the overnight hours on Sunday.  *** Sunday’s Forecast:   The flow on Sunday will become stronger and more southerly to bring the warmer temperatures and higher humidity to the region until Wednesday.  With increased flow that may be a little gusty at times, we will see more in the way of mixing to help bring concentrations back into the moderate range.  With dew point temperatures climbing into the 40s and flow coming from a region that also had a modified air mass in place on Saturday, PM 2.5 levels will stay more in the moderate range than fall back to good.  Temperatures will climb nearly ten degrees above normal as highs will be in the mid 50s.  Some cloud cover will remain, though we will see peaks of sunshine from time to time.  *** Monday’s Forecast:  A weak cold front will cross the region during the early overnight hours into Monday.  We will not see much of a change in conditions after this system passes, except for more westerly flow.  PM 2.5 levels should fall but remain moderate as high levels of moisture continue to hang around.  Temperatures will climb to near 60 degrees. — Roble
Here are some Air Quality Action Day tips you can follow to help reduce pollution:
Days when ozone levels are expected to be high:
    * Conserve electricity and set your air conditioner at a higher temperature.     * Choose a cleaner commute—share a ride to work or use public transportation. Bicycle or walk to errands when possible.     * Refuel cars and trucks after dusk.     * Combine errands and reduce trips.     * Limit engine idling.     * Use household, workshop, and garden chemicals in ways that keep evaporation to a minimum, or try to delay using them when poor air quality is forecast.
Days when particle pollution levels are expected to be high:
    * Reduce or eliminate fireplace and wood stove use.     * Avoid using gas-powered lawn and garden equipment.     * Avoid burning leaves, trash and other materials.
This forecast is brought to you by the Pennsylvania Department of Environmental Protection (PA DEP) and the Air Quality Partnership of the Susquehanna Valley. 
* For more information on the health effects of PM 2.5 and ozone, visit the EPA Airnow website. * To see the current forecast and monitoring information for the Southwest PA Region, visit us online at the PA DEP Forecast and Monitoring Site. * To find out more information about the Air Quality Partnership of the Susquehanna Valley, visit the AQP of SV Website.

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