*** Friday’s forecast: Another air quality action day is in effect for the day Friday as ozone production will again ramp up into the code ORANGE range. PM2.5 concentrations will remain moderate under a partly sunny sky with most, if all convection to hold off until the evening hours. 

*** Extended forecast: Better air quality is on the way Saturday with more clouds than sunshine, and showers and a thunderstorm around. Both fine particulate and ozone will improve to the upper good range as winds shift into the northeast. Partly sunny skies Sunday into Monday with a continued chance for mostly afternoon and evening thunderstorms. Air quality will continue to be in the upper good to lower moderate range. A strong cold front will finally push through towards the middle of next week to cool us off just in time for the arrival of September.---McAuliffe

Here are some Air Quality Action Day tips you can follow to help reduce pollution:

Days when ozone concentrations are expected to be high:

• Conserving electricity by setting air conditioning to a higher temperature;
• Combining errands to reduce vehicle trips;
• Limiting engine idling; and
• Refueling cars and trucks after dusk.

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.


For more information, visit DEP at, EPA’s AirNow at, or Delaware Valley Regional Planning Commission’s Air Quality Partnership at


To follow air quality in PHL between forecasts: "aqforecast" at