The nation’s parks are generally thought to be pristine natural havens. But a recent study finds the overwhelming majority suffer from air pollution problems like smog and ozone. That makes for important local and regional news stories, per the latest biweekly TipSheet. Get background, story ideas, resources and more.

It’s a category of more than 4,000 industrial chemicals that affect our lives nearly every day — and many of which are toxic. So what do journalists need to know to report on the emerging contaminants known as PFAS? Our most recent Issue Backgrounder offers a detailed primer on what PFAS are, where they come from, what their health effects are and how they might be cleaned up.

Millions of people across the United States are believed to be drinking PFAS-contaminated water. And a growing database could prove an invaluable resource for environmental journalists trying to get a handle on that public health risk. Our latest biweekly Reporter’s Toolbox, recently refocused on data journalism tools and techniques, explains how to tap the expanding PFAS data.

A revamped Reporter’s Toolbox begins today with a new focus on data resources for environmental journalists. The now biweekly column starts with a look at a massive database designed for federal land managers that reporters can use to scan dozens of pollution data sets about air quality and more in parks, forests and other federal lands.