I thought it might be something along those lines. How would I tell is the PA unit is using the new correction?
My unit appears here <https://map.purpleair.com/air-quality-standards-us-epa-aqi?opt=/1/lp/a10/p604800/cC0&select=196617#11/43.7324/-69.8443> on the PA map, and the page displaying your extension output is here <https://suiattle.net/CapeSmallHarborWeather/sp/bt/purple/index.html>. > On 10 Jan, 2025, at 11:51, 'John Kline' via weewx-user > <[email protected] <mailto:[email protected]>> wrote: > > There are two reasons these can differ. One, the PurpleAir map you are > showing is a 2m average while the weewx-purple loop packets are the most > recent reading. Also, the EPA has updated the AQI calculation (see: > https://www.epa.gov/system/files/documents/2024-02/pm-naaqs-air-quality-index-fact-sheet.pdf > > <https://www.epa.gov/system/files/documents/2024-02/pm-naaqs-air-quality-index-fact-sheet.pdf> > ). Weewx-purple has been updated with the new AQI calculation while the > PurpleAir map has not been. > > A third reason could be if the PurpleAir map is not using the EPA correction > (which corrects pm2_5)—see > https://www.epa.gov/sites/default/files/2021-05/documents/toolsresourceswebinar_purpleairsmoke_210519b.pdf > > <https://www.epa.gov/sites/default/files/2021-05/documents/toolsresourceswebinar_purpleairsmoke_210519b.pdf> > . I cannot tell if this is so from your screenshot. > >> On Jan 10, 2025, at 6:40 AM, Dan Hinckley <[email protected] >> <mailto:[email protected]>> wrote: >> >> When I access my PA unit directly, the readings I see are different from >> the one generated by the John Kline extension >> <https://github.com/chaunceygardiner/weewx-purple>. >> >> When I check right after WeeWx has generated new files on each loop, direct >> access to the PA shows this: >> >> <Screen Shot 2025-01-10 at 09.37.37.png> >> >> And the WeeWx-Purple displays this: >> >> <Screen Shot 2025-01-10 at 09.37.56.png> >> >> I don't know enough about how the AQI is calculated to know if this >> discrepancy is normal or is something else. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "weewx-user" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] >> <mailto:[email protected]>. >> To view this discussion visit >> https://groups.google.com/d/msgid/weewx-user/C40F997E-F8DC-452D-9D30-3C8307C08AB1%40suiattle.org >> >> <https://groups.google.com/d/msgid/weewx-user/C40F997E-F8DC-452D-9D30-3C8307C08AB1%40suiattle.org?utm_medium=email&utm_source=footer>. > > > -- > You received this message because you are subscribed to the Google Groups > "weewx-user" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To view this discussion visit > https://groups.google.com/d/msgid/weewx-user/A5AED7CB-4982-4A46-BD84-8A211646C0E5%40johnkline.com > > <https://groups.google.com/d/msgid/weewx-user/A5AED7CB-4982-4A46-BD84-8A211646C0E5%40johnkline.com?utm_medium=email&utm_source=footer>. -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/weewx-user/2D6FE60B-105B-4524-86BA-F94D046B70F1%40suiattle.org.
