[pointillistic]

This is way beyond air, this is water we drink, the chemicals in processed food, the pesticides in the produce. The compounds in furniture, paints, stains, carpeting, general building materials including insulation, plastic plumbing,HVAC components, insistence on living in un-ventilated, year around closed windows spaces.

[arpa]

This is also about population density and the lifestyle in more populated (denser) areas.