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DEP declares Ozone Air Quality Action Day for Friday, Sept 18

A(n) Air Quality Action Day has been declared for Susquehanna Valley, PA, on Friday, Sep 18
Tomorrow’s Forecast
Friday, Sep 18: 102 AQI Unhealthy for Sensitive Groups Ozone
64 AQI Moderate Particle Pollution (2.5 microns)

Extended Forecast
Saturday, Sep 19: 72 AQI Moderate Ozone
56 AQI Moderate Particle Pollution (2.5 microns)
Current Conditions: A strong area of high pressure continues to hold it’s grip on the area at 2 p.m. EDT this Thursday afternoon. Under the high, winds are very light to near calm. Over the past couple of days, this has allowed both fine particulate and ozone precursors to build up. The result of this is that ozone levels are in the code ORANGE range this afternoon. Winds will continue light into the day Friday, with enough sunshine and heat available to again push ozone levels upward into the lower code ORANGE range. For tonight, we expect a mainly clear sky and comfortable conditions. Lows will bottom out close to 60 degrees. *** Friday’s forecast: More sunshine than clouds for Friday with temperatures topping out well above normal for this point in September. With very little mixing, ozone will rise to the lower code ORANGE range across the area. Fine particulate will continue to be well into the moderate range. Mostly clear and mild Friday night with lows in the lower 60s. *** Extended forecast: Relief is in sight for those who seek better air quality as a cold front will pass through sometime Saturdaynight. During the day Saturday, expect clouds and sunshine with increasing south winds. These winds will keep fine particulate and ozone levels in the middle moderate range. Still on the warm side with afternoon temperatures in the middle 80s. Turning cooler with winds shifting into the north on Sunday. High temperatures will only recover into the lower to middle 70s. Air quality will improve to the good range. More clouds than sunshine with onshore winds developing as we move into the early part of next week. Low levels of ozone and fine particulate will result as temperatures may struggle to reach 70. The middle of the week looks to be mostly dry, with temperatures just a little above normal. Air quality should remain good due to a continued easterly flow.—McAuliffe

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