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It’s the Friday news roundup! Residents are raising a stink about bad — and possibly dangerous — smells around the Shell cracker in Beaver County, iffy allergies aren’t the only issues with our up-and-down Spring temperatures, and it’s Arbor Day! Stick around for how to request a free tree from the city and which little neighborhoods have the fullest canopy cover.

We love to cite our sources:

Colin’s latest reporting focuses on temperature inversions. Part 4 is available via City Paper. The Allegheny Front will have the next report.

The state Department of Environmental Protection is investigating the Shell plant.

The Beaver Co. Times talked to residents who reported strong smells after a hydrocarbon release, as well as elevated levels of benzene following an April 11 malfunction.

City Cast Pittsburgh talked to Danielle Crumrine with Tree Pittsburgh about our city’s tree canopy last spring. She talked a lot about the evolution of tree selection around our electrical grid and what lawmakers can do to help local homeowners.

And check out our City Cast Pittsburgh episode about the SmellPgh app and why the city sometimes smells like rotten eggs.

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