Spent way too much time researching air quality monitors last night. Want outdoor one to better understand what's happening in our immediate area & contribute to maps for others. Want an indoor one to understand what quality is like when we have windows shut. FWIW, my rundown....
Let's start with outdoors. Turns out we have fairly sparse network of official sensors because: expensive! But been huge growth in unofficial sensors by people wanting better local data. Some articles:

wired.com/story/bay-area…

energyathaas.wordpress.com/2019/01/02/my-…

cnbc.com/2020/09/12/air…
PurpleAir seems pretty much the standard for outdoors monitoring. They maintain a popular map that lets you narrow in on areas and see what other owners are reporting. I *love* that you can toggle off those reporting indoor from outdoor sensors. Map: purpleair.com/map
Another bump for PurpleAir is that its sensors are being included as an optional layer for the EPA's @AIRNow Fire & Smoke map: fire.airnow.gov

This is also a good article on why you'll see different numbers from official sensors: thebolditalic.com/understanding-…
I like how PurpleAir sounds so much that I ordered one. Like a gazillion other people -- they now have 6-8 week backlog. So what other outdoor sensors might you try? @IQAir has a popular crowdsourced map iqair.com/air-quality-map but it seems really based off PurpleAir sensors.
The @IQAir monitor can be placed outside (as the manual says), but it's really designed more to be an indoor sensor. That led me to wonder about the small portable sensors from @atmotube (Pro) and @Plume_Labs (Flow 2). Outdoor & indoors, great! But do they work....
Normally, I'm all about @wirecutter for reviews of products, but its review of air quality monitors is only for indoor products and specifically omits portable devices: nytimes.com/wirecutter/rev…

What to do? Enter the amazing @SouthCoastAQMD .....
Turns out that @SouthCoastAQMD has been testing *lots* of personal sensors to see how well they do against official commercial sensors. It's an amazing resource. All listed tested in the field; selected ones brought in for lab testing: aqmd.gov/aq-spec/evalua…
The key part of @SouthCoastAQMD testing summary is the R2 number. The closer that is to 1, the closer the personal sensor matched commercial ones. From this, I had more faith in @atmotube, PurpleAir got great marks, @IQAir seemed to do well aqmd.gov/aq-spec/evalua…
The @HabitatMap AirBeam2 looked interesting & rated OK, but I didn't see a lot of sensors on its crowdsource map. Still perhaps a good alternative for those who can't wait on PurpleAir, assuming they ship quickly (I don't know): aqmd.gov/aq-spec/evalua…
I really *loved* that the Air Quality Egg rated well and has options for more than PM2.5 sensors. Like why can't we have more sensors in all of these? But no idea how quickly it ships, usage according to its (slow) map seems sparse: airqualityegg.com/portal/
How about indoor air quality monitors? As said, @wirecutter has nice review: nytimes.com/wirecutter/rev…

As you might expect, the top pick is sold out. The alternative is in stock but not the wifi version. And I really love things having connectivity.
As an aside, I have a @netatmo system that I adore. Several modules in the house give me temp, humidity and CO2. Outdoors module for temp there, plus I have a wind & rain sensor. Pity they don't have PM 2.5 or other sensors. Please maybe think about this....
In the end, I realized two of my @Dyson fans with wifi have air quality monitors built in. I never paid much attention to this aspect before. Normally I use them as fans on hot days with the windows wide open. Now, windows shut, they tell me indoor air quality and purify. Nice...
Of course, @wirecutter did a great review of air purifiers: nytimes.com/wirecutter/rev…

Dyson didn't make the list there, because they're expensive. But the top choices are hard to find now....
Dyson's still seem widely available, so maybe a good choice if you want indoor air monitor & purifier in one. Even when it's not running, it samples the air. Auto turn on if you want if quality gets bad. Pro tip: Dyson outlet has good deals if you're OK with shorter warranty.

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More from @dannysullivan

24 Sep 18
It's our 20th birthday week at @Google and we're having a special event today in SF to share a look at the future of search. I'll be tweeting a few things....
This is a look back at a big change in search but which continues to be important: understanding synonyms. How people search is often different from information that people write solutions about.
Last few months, Google has been using neural matching, --AI method to better connect words to concepts. Super synonyms, in a way, and impacting 30% of queries. Don't know what "soap opera effect" is to search for it? We can better figure it out.
Read 18 tweets
5 Jul 18
This article from @noUpside covers the issue of getting good health info when there's a "data void" or "search void" using "vitamin k shot" as an example, where a site advising against this for newborns ranks tops. Here's how Google addresses such things. wired.com/story/the-comp…
Most important, we began working with trusted health partners to ensure we surface high-quality medical information for a variety of diseases and symptoms. This began in 2015. Here are some examples and background:

blog.google/products/searc…

blog.google/products/searc…
Those special boxes continue to grow. As for our search results, we're constantly working to improve those so they reflect high-quality authoritative content. We even test our improvements against human raters, to see if they're increasing the quality....
Read 10 tweets
12 Dec 17
I'm just testing the new Twitter threads feature....
To make a thread, you click on the + button down there....
I think this is going to be very useful because I'm so lame at the whole replies thing. Do I reply to my first tweet? To the last reply? I could never figure it out....
Read 6 tweets
7 Nov 17
Yesterday, Google briefly carried tweets with dubious info about Texas shooting suspect Devin Patrick Kelley. Here's more on our reaction….
Gizmodo documents some of the tweets that appeared. The story gizmodo.com/once-again-goo… does have our statement, but here's more from us....
Our official statement. In short, tweets from Twitter but Google’s algorithm ranks them. Given issues yesterday, we want to improve that.
Read 15 tweets

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