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Last year I bought a particular sensor (I intended it to be a science project for my son): https://nettigo.eu/products/nova-fitnes-sds011-air-quality-s...

I carried it around with me for a few days in London, commuting in by train from the suburbs. There were two places that had the highest particulate levels. The first was in my kitchen when I was cooking (no comment!), and the second was on the London Underground. Particulates were far higher on the tube than on the street in central London. So high I would have thought it was a serious health risk for tube drivers. Presumably this mostly comes from the steel wheels on steel track. I don't know whether ingesting steel particulates is more or less healthy than other particulates though. Has anyone done any studies into whether tube drivers have higher rates of health problems than overground drivers?

Edit: table 1 of this paper confirms that the particulates on the underground are mostly iron: https://assets.publishing.service.gov.uk/government/uploads/...

>Presumably this mostly comes from the steel wheels on steel track

Highly unlikely. Steel-on-steel is used because it lasts for YEARS without needing replacing due to wear.

Some of it is from that but mostly from the brake pads. You can see it collect on those cylinders between carriages.

What kind of cooking were you doing? High temp ( near smoke point) with oil is supposed to be very bad for health. Gas ramge?

Frying food seemed to be particularly bad, even with the extractor running. If it's not too cold, I open the kitchen door now when I'm frying. Burning the toast doesn't help either. And candles resulted in fairly high levels too (my wife is Danish, so candles are a big thing in our house).

If anything I'd suspect friction brakes as the source of the particles.

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