I thought that was one of the advantages of living in rural France.
Actually the windows are surprisingly clever. It's the doors that are slapdash. The exterior doors (=newer) are pretty good. The interior doors (between heated and unheated rooms) are another matter -- but as I recall, US interior doors are crap too.
Mercury never existed untl it was invented by Wicked Chemical Cartels!
......who must have been the makers of my childhood chemistry set. I remember playing with the stuff as a kid....rolling it around in my palm and watching it separate and puddle together. But that was back when smoking was actually good for you. Then, all of a sudden, that pesky US Surgeon General came along (Dr. Everett Koop, I think?) and said it wasn't and everything went to hell.
Mercury occurs naturally at low level in the environment as mercuric oxide or other mercury salts. It is not found in the air except as dust from natural ore deposits, and never as a free metal. I was referring above to mankinds augmentation of mercury release through TV tubes, electronics and fluorescent bulbs among others. We used to use mercury salts for merthiolate and skin lotions such as calomine.
You are talking to one of the guys who actively worked on removal of mercury and cadmium from paper emulsions. It was an uphill struggle against some in management at EK who didn't want to spend an arm and a leg of corporate profit at a time when this was not a huge environmental issue but only one looming on the distant horizon.
You are talking to the guy who designed the first practical Kodak blix replacing potassium ferricynaide with Ferric EDTA, and who developed a 100% polution free process which never was commercialized by EK. Its effluent was drinkable water.
So, I understand and studied environmental concerns for years as I worked on the emulsions and processing chemistry. We exchanged the heavy metal salts for rather mild organic chemicals or less harmful metal salts at very much lower concentration.