Low-VOC paint
Also called: low VOC, zero-VOC paint, no-VOC paint, VOC, volatile organic compounds, paint fumes, GreenGuard paint
Paint with a reduced level of volatile organic compounds — the solvents that evaporate as it dries and cause the smell and headaches. Federal and California rules cap VOCs; 'low' is typically under 50 g/L and 'zero' under 5 before tinting. Now standard for interiors at little premium.
VOCs are the carbon-based solvents in paint that evaporate as the film dries. They’re what you smell, and in a closed room they’re what causes the headache, the eye irritation and, over years of exposure in the trades, worse. Oil-based paints are heavy in them; water-based latex is much lower, and the paint industry has spent two decades driving it down further under EPA limits and the stricter California and Northeast rules most national brands now meet everywhere.
The labels: low-VOC generally means under 50 grams per liter for flat and under 100 for other sheens, though there’s no single federal definition; zero-VOC means under 5 g/L. Both are measured before tinting — the colorant adds VOCs, and a deep color in a “zero” base can end up at low-VOC levels. Third-party marks (GreenGuard Gold, Green Seal) test the finished paint’s emissions rather than the can’s formula and are the better guide for a nursery or a bedroom you’ll sleep in the same night.
What it costs: nothing to a few dollars a gallon. Most mid-grade and premium interior lines are low- or zero-VOC by default; it’s the trim enamels, oil-based primers and shellac stain-blockers that still carry the smell, and those are used in small quantities with a window open. Ventilate for a day either way, and for a pre-1978 house the bigger air-quality question is the lead in the old layers, not the VOCs in the new one.