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Monitor air quality along the Midpeninsula in real time

Original post made on Aug 24, 2020

Residents can track the air quality in their neighborhoods through an interactive, crowdsourced map that uses information from private sensors throughout the region to measure dust, smoke and other particulate matter.

Read the full story here Web Link posted Sunday, August 23, 2020, 2:19 PM

Comments (4)

5 people like this
Posted by Eva_PA
a resident of Ventura
on Aug 24, 2020 at 10:21 am

Eva_PA is a registered user.

Thanks for publicizing this. The EPA AirNow monitor for Palo Alto is located in Redwood City and only updates every couple of hours. PurpleAir provides real-time updates about what the actual air quality is in our neighborhoods.


7 people like this
Posted by Clara Drivers
a resident of Midtown
on Aug 24, 2020 at 11:18 am

Clara Drivers is a registered user.

PurpleAir is great. Just make sure you filter out the indoor monitors from the outdoor monitors when viewing their map. The indoor monitors have a black circle outline, and the outdoor monitors do not. Click on "Inside Sensors" in the key to hide those so you are only seeing the outdoor ones.


5 people like this
Posted by Andrea J
a resident of Menlo Park
on Aug 24, 2020 at 4:37 pm

Andrea J is a registered user.

One of my neighbors on Nextdoor posted the following about PurpleAir readings:
"It turns out that the PurpleAir sensors, which are a fraction of the cost of EPA regulatory-grade sensors, are systematically higher than EPA data, by up to a factor of 2! On the PurpleAir map, there is an option to adjust the readings based on calibration against regulatory readings. To do this, in the lower left corner of the PurpleAir map, under the word "Conversion" there's a pull-down menu. You can select "LRAPA" conversion (developed by an Oregon agency) which I think is more appropriate than the second option (Utah agency, based on winter data). More details at: Web Link."


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Posted by Julia
a resident of another community
on Sep 2, 2020 at 12:15 pm

Julia is a registered user.

Great article, PurpleAir is an awesome resource. Here is another air quality resource for the Bay Area that incorporates Purpleair data into an hourly "nowcast" air quality model if anyone is interested in poking around: Web Link


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