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Comment by z9znz | Hacker News Reader

Related: finding air quality measurement devices seems very difficult. It would be nice to know all the things in the air which we are concerned about - CO, CO2, Radon, PPM-stuff, etc. It seems few devices do it all, and some of them actually fake it (using a lookup table based on other measurements).

I'm hoping one of these days someone on HN who is an authority will post a buyer's guide.

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+1, I'd like to buy one, but it's difficult to tell what works well.

Currently thinking about this one: https://shop.aranet.com/europe/product/aranet4-home

but don't have a reference how good it is. I just assume it's better than the CO2Meter RAD-0301, which costs 3x less, but it could be I'm just paying for the battery.

Anyone has good recommendations?

With DIY, you have the option of looking at sensor manufacturer spec sheets, e.g. there are previous HN threads on the sensors used in the DIY Air Gradient PCB.

A challenge with consumer-grade sensors is lack of calibration. Here are some comparisons of PM sensors, relative to a more expensive reference meter, https://news.ycombinator.com/item?id=32376719

> I'm hoping one of these days someone on HN who is an authority will post a buyer's guide.

I’m guessing you would need to buy products from a commercial building controls line to get sensors that actually work. Alerton (Honeywell), Distech, Johnson Controls, Automated Logic, Siemens, Trane, and others have commercial building automation lines.

Airthings View Plus [1] has 7 sensors, but not CO. It's working well for me. The app informs me when some readings are above a certain threshold.

1. https://www.airthings.com/view-plus

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