Is it safe to grow your own vegetables if you live in a polluted city?

What's actually in it

Urban gardens are often near roads, old buildings, or former industrial sites. The soil holds legacy lead, cadmium, microplastics, PAHs, and pesticides. Airborne pollution deposits onto leaves. Vegetables pull soil chemicals up through roots and catch air particles on surfaces. Leafy greens and root vegetables accumulate the most. A garden that looks thriving can still be a contamination source.

The health payoff of home-grown vegetables is real. The question is whether the soil and air is right.

What the research says

A 2026 review in J Agric Food Chem examined vegetable-borne microplastics and laid out evidence, uncertainties, and a research agenda for food-chain risk assessment. Vegetables grown in contaminated soils absorbed microplastics into edible tissues. Urban soils had higher levels than rural farm soils.

For city gardens, get soil tested for heavy metals and PFAS. Most state extension services do testing cheaply ($25-50). If soil is contaminated, use raised beds with imported clean soil and a landscape fabric barrier. Grow tomatoes and peppers (which accumulate less soil contaminant than leafy greens) over lettuce and spinach. Wash all home-grown produce thoroughly, including homegrown. For pots and containers, use food-safe soil mixes and avoid treated lumber for raised bed frames.