Rural or small town with low traffic Suburban area near a city Major metropolitan area Dense city or near industrial / high-traffic zones

Reverse osmosis or high-quality filtration Basic carbon filter (Brita-style) Mostly tap water Mostly bottled water

Rarely or never 1 cup per day 2–3 cups per day 4+ cups per day

Organic, third-party tested coffee Organic coffee (not tested) Conventional grocery store coffee Office, gas station, or unknown-source coffee

Rarely A few times per week Daily Multiple times per day

Stainless steel, cast iron, or ceramic A mix of safe cookware and nonstick Mostly nonstick cookware Old or scratched nonstick cookware

Clean / fragrance-free brands A mix of clean and conventional Mostly conventional brands I don't check ingredients

Never Occasionally Daily Multiple fragrance sources daily

Outdoors or well-ventilated, low chemical exposure Office with good ventilation Office with recycled indoor air Industrial, medical, salon, factory, or high-chemical setting

Never 1–2 drinks per week 3–5 drinks per week Daily or near-daily

Never Occasionally Often Almost always