Zero VOC paint has fewer than 5 grams per liter - virtually free of VOCs. That's not to say they don't contain harmful chemicals, though.
What Is Low VOC Paint?
The Toxic Truth About Most “low-VOC” and “zero VOC” Paints
Non-Toxic Paint With Low VOC Emissions - What to look for and
The 8 Best Zero-VOC Paints
Choosing non-toxic paint - Ecohome
Are Paint Fumes Bad To Inhale In Your Home? - HouseFresh
The Best Indoor Air Quality Practices for Indoor Painting
Non-Toxic Paint: A Look at AFM Safecoat's Zero-VOC Interior Paint
5 Zero-VOC Paints to Keep Toxic Fumes Out of Your Home - Utopia
What Are Zero-VOC Paints, and Which Paint Brands Sell Them?
Real Zero VOC Interior Paint