This is an illustration of how close should an installation (or in this case a source of pollution) be from your house. Apparently a wind farm needs to be sited further away from your home compared to coal-fired power plant.
Pretty cool way of putting things into perspective.
A seemingly harmless wind turbines must be built far away, while coal power station and gas well (coal seam gas) can be built just stone throw away from residential area.
This graph is believed to be the work of campaigners against coal seam gas project in Gippsland, a large rural region in Victoria, Australia.