What we took away.

When we started this project, air quality felt like something far away, a headline about Delhi, or a color on a weather app. What surprised us most is how personal it turned out to be. The same pollutants shortening lives in Delhi or L.A. are drifting through our own city too, and you can trace them right back to the roads we drive and the power we use.

The good news: we already know what works. The Clean Air Act, London's congestion charge, the shutdown of old coal plants in the Northeast, every one of them is proof that when governments, engineers, and communities push in the same direction, the air really does get cleaner and people really do live longer. That 78% drop in U.S. air pollutants since 1970 didn't happen by accident.

The harder part is that clean air is never really "done." New problems keep showing up, wildfire smoke, warehouse truck traffic, crypto mining, and old problems have a way of coming back. And almost every time, the worst air ends up in the neighborhoods with the least power to push back. If you take away just one number from this site, make it this one: 7 million people die every year because of air pollution. That's a number we can actually change.