New in the library: air quality, clean water and groundwater

We've added a new document to the library: Air Quality, Clean Water Act and Groundwater. It brings together short, plain-language explanations from U.S. government sources, so you can read the basics in one place.

What's inside

The guide covers three topics:

• Air quality and the Air Quality Index. What the index measures, and what the colors and numbers mean for your day.
• The Clean Water Act. How the law sets quality standards for lakes, rivers and coastal waters, and who is responsible for them.
• Groundwater and aquifers. Where the water under our feet is stored, and why it matters for drinking water.

Who it's for

It's written for anyone who wants a quick, reliable starting point: residents, students, community groups and staff who answer questions from the public.

Tip: each section of the guide has its own link, so you can share the exact part someone needs.

How to use it

1. Open the guide.
2. Use the list of sections at the top to jump to a topic.
3. Follow the source links at the end to read the original pages.

More to come

We're adding documents on a regular basis. See all updates or browse the whole library.