Air Quality Action Day declared for June 4

A(n) Air Quality Action Day has been declared for Susquehanna Valley, PA, on Friday, Jun 4
Tomorrow’s Forecast
Friday, Jun 4: 103 AQI Unhealthy for Sensitive Groups Ozone

Extended Forecast
Saturday, Jun 5: 78 AQI Moderate Ozone
Current Conditions: After a sunny, warm and dry afternoon across much of Pennsylvania yesterday, summertime humidity and the chance for showers and thunderstorms will make their return Thursday. Southwest flow around a departing ridge to our east will enhance the hazy, hot and humid conditions as the afternoon progresses. A weak trough to our north will slide across the state, igniting showers and thunderstorms in the moist and unstable airmass by evening. Some of these storms could be severe, with a few damaging wind gusts possible. Fortunately, these thunderstorms will quickly begin to dissipate after sunset. Ozone levels will be elevated due to the sunshine and stagnant airmass in place over the state, rising through the Moderate range before clouds and showers move through. Any rain we see this evening will temporarily reduce both Ozone and Particulate Matter levels to the lower Moderate range by Friday morning. *** Friday’s forecast: The trough moving into the region on Thursday will have a tough time advancing much farther south on Friday. Therefore, warm and muggy air with partly sunny skies will linger throughout much of the day. These factors, combined with an extremely stagnant airmass already in place over the region for the past few days, will result in Code Orange Ozone levels late Friday afternoon. This will be our first forecast Ozone Action Day of the season. Particulate Matter will be elevated into the Moderate range across the region as well. High temperatures will once again be much above normal for this time of year, reaching into the upper 80s by evening. *** Extended forecast: This weekend appears unsettled as two systems make a run at our region. On Saturday, expect fair skies and continued warm and muggy conditions for much of the afternoon. An area of low pressure will pass to our north later in the day, dragging scattered showers and thunderstorms through the region towards evening. Ozone levels could once again reach Unhealthy levels if the clouds and precipitation hold off till later in the day. On Sunday, a much stronger storm system will move into the region from the west. Potent upper level energy will push this low pressure and an associated cold front all the way through Pennsylvania by Sunday night. Expect mostly cloudy skies on Sunday with frequent showers and perhaps even some steadier rainfall. Air quality levels will drop overnight Saturday into the lower Moderate range for Sunday. A fresh, clean airmass will move into Pennsylvania following the departure of this storm system on Monday. Sunny skies and cool, dry conditions will finally return to the area for the first part of the work week. —Charnick—
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.

from Susquehanna Air Quality Partnership

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