# Latest **URL:** https://community.purpleair.com/latest.md [Latest](https://community.purpleair.com/latest.md) · [Categories](https://community.purpleair.com/categories.md) --- ## [PurpleAir Data Download Tool](https://community.purpleair.com/t/purpleair-data-download-tool/3787)
**Author:** [@PurpleAir](https://community.purpleair.com/u/PurpleAir)\ **Replies:** 18\ **Last updated:** [September 5, 2025, 7:11pm UTC](https://community.purpleair.com/t/purpleair-data-download-tool/3787 "2025-09-05T19:11:22Z")
This article is related to the PurpleAir API. If you are unfamiliar with it, check out our About the PurpleAir API page to get started. The PurpleAir Data Download Tool is an open-source tool for downloading PurpleAir… --- ## [PurpleAir Map Guide](https://community.purpleair.com/t/purpleair-map-guide/90)
**Author:** [@PurpleAir](https://community.purpleair.com/u/PurpleAir)\ **Replies:** 7\ **Last updated:** [May 1, 2025, 4:53pm UTC](https://community.purpleair.com/t/purpleair-map-guide/90 "2025-05-01T16:53:31Z")
This guide introduces the PurpleAir map and helps you navigate its features with confidence. Whether you’re just getting started or need a quick refresher, it’s here to support your understanding. What You See on … --- ## [Welcome to the PurpleAir Community](https://community.purpleair.com/t/welcome-to-the-purpleair-community/7)
**Author:** [@PurpleAir](https://community.purpleair.com/u/PurpleAir)\ **Replies:** 0\ **Last updated:** [August 27, 2021, 12:07am UTC](https://community.purpleair.com/t/welcome-to-the-purpleair-community/7 "2021-08-27T00:07:45Z")
PurpleAir would not be what it is without you, our incredible community of citizen and professional scientists, curious members of the public, or concerned citizens. You make it possible to provide this service by hostin… --- ## [Clear vs White PIXEL: whose side are you on?](https://community.purpleair.com/t/clear-vs-white-pixel-whose-side-are-you-on/22894)
**Author:** [@Andrew\_Meiners\_PA](https://community.purpleair.com/u/Andrew_Meiners_PA)\ **Replies:** 23\ **Last updated:** [September 23, 2026, 4:49pm UTC](https://community.purpleair.com/t/clear-vs-white-pixel-whose-side-are-you-on/22894 "2026-09-23T16:49:01Z")
Full disclosure: I’m on Team Clear. Bias? Crystal clear. The tech bros think a PIXEL should show its circuit board. It’s the most beautiful part of the device, hiding it is a cover-up, and we mean that literally. The … --- ## [FLEX temperature and VOC units](https://community.purpleair.com/t/flex-temperature-and-voc-units/22916)
**Author:** [@OU\_livinglab](https://community.purpleair.com/u/OU_livinglab)\ **Replies:** 0\ **Last updated:** [September 9, 2026, 11:00am UTC](https://community.purpleair.com/t/flex-temperature-and-voc-units/22916 "2026-09-09T11:00:31Z")
Hello, Is it possible to change the default temperature units on a FLEX so that the temperature that is displayed on the map, saved to the SD card and for API download to degrees celsius (˚C)? I’m using this for educati… --- ## [Map is down?](https://community.purpleair.com/t/map-is-down/22909)
**Author:** [@vaultsurveyor](https://community.purpleair.com/u/vaultsurveyor)\ **Replies:** 2\ **Last updated:** [September 8, 2026, 7:25pm UTC](https://community.purpleair.com/t/map-is-down/22909 "2026-09-08T19:25:15Z")
Seems like all sensors are gray at the moment. Edit: resolved about an hour or two later. --- ## [Disconnecting unit during winter](https://community.purpleair.com/t/disconnecting-unit-during-winter/22915)
**Author:** [@kwimberg](https://community.purpleair.com/u/kwimberg)\ **Replies:** 0\ **Last updated:** [September 8, 2026, 1:52pm UTC](https://community.purpleair.com/t/disconnecting-unit-during-winter/22915 "2026-09-08T13:52:23Z")
During winter where I live, the air quality is always clean. Would it benefit the longevity of my sensor to disconnect it and reconnect in the spring? --- ## [Correction equation for newer generation hardware?](https://community.purpleair.com/t/correction-equation-for-newer-generation-hardware/22914)
**Author:** [@heroic](https://community.purpleair.com/u/heroic)\ **Replies:** 0\ **Last updated:** [September 7, 2026, 2:42am UTC](https://community.purpleair.com/t/correction-equation-for-newer-generation-hardware/22914 "2026-09-07T02:42:54Z")
Hi all, In researching a particulate matter sensor to purchase I started heavily considering purpleair sensors. Doing a bit of research, I found the Karoline Barkjohn paper about the correction equation that can be appl… --- ## [Watch Duty claims my sensor is offline IT IS NOT](https://community.purpleair.com/t/watch-duty-claims-my-sensor-is-offline-it-is-not/22886)
**Author:** [@jim](https://community.purpleair.com/u/jim)\ **Replies:** 2\ **Last updated:** [September 2, 2026, 4:17pm UTC](https://community.purpleair.com/t/watch-duty-claims-my-sensor-is-offline-it-is-not/22886 "2026-09-02T16:17:17Z")
Watch Duty app & website shows my sensor as off line at times and complety gone at others and on line every now and them. - but an immediate check on the PA map shows it’s on line - and has been on line for days. WD says… --- ## [What happened to my account or sensors?](https://community.purpleair.com/t/what-happened-to-my-account-or-sensors/22888)
**Author:** [@JetForMe](https://community.purpleair.com/u/JetForMe)\ **Replies:** 2\ **Last updated:** [September 2, 2026, 3:59am UTC](https://community.purpleair.com/t/what-happened-to-my-account-or-sensors/22888 "2026-09-02T03:59:36Z")
I always thought I had a username/password for this site. I haven’t logged in in ages, but when I tried to just now, the only option seems to be signing in with Google. The “not Google” link just says all I need is an em… --- ## [How to explain significant difference between Smoggie and Purple Flex Humidity?](https://community.purpleair.com/t/how-to-explain-significant-difference-between-smoggie-and-purple-flex-humidity/22891)
**Author:** [@davepwhite](https://community.purpleair.com/u/davepwhite)\ **Replies:** 4\ **Last updated:** [August 18, 2026, 9:37pm UTC](https://community.purpleair.com/t/how-to-explain-significant-difference-between-smoggie-and-purple-flex-humidity/22891 "2026-08-18T21:37:43Z")
I have a Flex located outdoors directly next to a uRad Smoggie. I believe both use the same pm2.5 sensor. And sometimes I even get the same particle count :slight\_smile: But the Smoggie does not compute/report the US EP… --- ## [What are the pm2.5 levels used as breakpoints on Purple Map?](https://community.purpleair.com/t/what-are-the-pm2-5-levels-used-as-breakpoints-on-purple-map/22883)
**Author:** [@davepwhite](https://community.purpleair.com/u/davepwhite)\ **Replies:** 3\ **Last updated:** [September 1, 2026, 8:35pm UTC](https://community.purpleair.com/t/what-are-the-pm2-5-levels-used-as-breakpoints-on-purple-map/22883 "2026-09-01T20:35:10Z")
I have a Flex outside and I want to be sure I understand the pm2.5 levels being used to compute the US EPA AQI I see on the map for my sensor. I am using real-time and applying the US EPA “conversion”. Also, I am not s… --- ## [Sensor correction request - or exclude?](https://community.purpleair.com/t/sensor-correction-request-or-exclude/22884)
**Author:** [@beewang](https://community.purpleair.com/u/beewang)\ **Replies:** 1\ **Last updated:** [September 1, 2026, 7:25pm UTC](https://community.purpleair.com/t/sensor-correction-request-or-exclude/22884 "2026-09-01T19:25:57Z")
There is a sensor near mine that is clearly erroneous - AQI is 3000+ most of the time. Can this be corrected or can I manually exclude it from my real time map? It’s called Swiss Ln --- ## [About the PurpleAir API](https://community.purpleair.com/t/about-the-purpleair-api/7145)
**Author:** [@PurpleAir](https://community.purpleair.com/u/PurpleAir)\ **Replies:** 4\ **Last updated:** [September 1, 2026, 7:20pm UTC](https://community.purpleair.com/t/about-the-purpleair-api/7145 "2026-09-01T19:20:13Z")
The PurpleAir API The PurpleAir API is a web service that allows you to obtain air quality data reported by PurpleAir sensors. This is an extensive dataset going back to early 2016. Users wanting to jump straight into … --- ## [SD Storage Best Practices (QA/QC) for Offline Data Collection](https://community.purpleair.com/t/sd-storage-best-practices-qa-qc-for-offline-data-collection/22906)
**Author:** [@ERICK\_TERRAZAS\_UCB](https://community.purpleair.com/u/ERICK_TERRAZAS_UCB)\ **Replies:** 0\ **Last updated:** [September 1, 2026, 12:07am UTC](https://community.purpleair.com/t/sd-storage-best-practices-qa-qc-for-offline-data-collection/22906 "2026-09-01T00:07:03Z")
Hello to the research community! When conducting 100% offline (no Wi-Fi) air quality monitoring campaigns outdoors, the microSD card goes from being a simple hardware component to becoming the sole safeguard for our pri… --- ## [API Pricing](https://community.purpleair.com/t/api-pricing/4523)
**Author:** [@PurpleAir](https://community.purpleair.com/u/PurpleAir)\ **Replies:** 52\ **Last updated:** [August 25, 2026, 8:17pm UTC](https://community.purpleair.com/t/api-pricing/4523 "2026-08-25T20:17:13Z")
The PurpleAir API uses a points-based billing system. API calls consume points, and if you do not have enough points to make an API call, the API will return an error. If you are a PurpleAir sensor owner, you can get d… --- ## [PM2.5 Layer Widgets Should Display Fractional Information](https://community.purpleair.com/t/pm2-5-layer-widgets-should-display-fractional-information/22899)
**Author:** [@davepwhite](https://community.purpleair.com/u/davepwhite)\ **Replies:** 0\ **Last updated:** [August 24, 2026, 7:15pm UTC](https://community.purpleair.com/t/pm2-5-layer-widgets-should-display-fractional-information/22899 "2026-08-24T19:15:35Z")
In comparing a widget showing current AQI to a widget (identical sensor) showing raw PM2.5µg/m³, it is clear to me now that the data do not actually match because the raw PM2.5 being shown does not include the fractional… --- ## [Purple US EPA Index Seems Strange](https://community.purpleair.com/t/purple-us-epa-index-seems-strange/22898)
**Author:** [@davepwhite](https://community.purpleair.com/u/davepwhite)\ **Replies:** 1\ **Last updated:** [August 24, 2026, 5:05pm UTC](https://community.purpleair.com/t/purple-us-epa-index-seems-strange/22898 "2026-08-24T17:05:52Z")
I have a Purple Flex installed outside and I monitor it from my phone’s home screen using the “widgets” offered on the Purple Map. I like to know the current readings so I use the “real time” overlay along with the US… --- ## [Have the EPA PM2.5 Breakpoints Changed?](https://community.purpleair.com/t/have-the-epa-pm2-5-breakpoints-changed/22858)
**Author:** [@Wiley\_Sanders](https://community.purpleair.com/u/Wiley_Sanders)\ **Replies:** 4\ **Last updated:** [August 20, 2026, 2:56am UTC](https://community.purpleair.com/t/have-the-epa-pm2-5-breakpoints-changed/22858 "2026-08-20T02:56:49Z")
Previous posts for the EPA PM 2.5 show these breakpoints: Good 0 - 50 | 0.0 – 12.0 Moderate 51 - 100 | 12.1 – 35.4 Unhealthy for Sensitive Groups 101 – 15… --- ## [Consulta sobre la automatización de descarga de datos de Brazilian PM2.5](https://community.purpleair.com/t/consulta-sobre-la-automatizacion-de-descarga-de-datos-de-brazilian-pm2-5/22896)
**Author:** [@Richard\_Daniel\_Munoz](https://community.purpleair.com/u/Richard_Daniel_Munoz)\ **Replies:** 0\ **Last updated:** [August 19, 2026, 5:07am UTC](https://community.purpleair.com/t/consulta-sobre-la-automatizacion-de-descarga-de-datos-de-brazilian-pm2-5/22896 "2026-08-19T05:07:29Z")
El problema que estoy teniendo es que los datos que obtengo mediante la API no coinciden con los datos que descargo directamente desde el mapa de PurpleAir. Por ejemplo, desde el mapa de PurpleAir ingreso a la página we… --- ## [How to make US-EPA conversion the default?](https://community.purpleair.com/t/how-to-make-us-epa-conversion-the-default/22885)
**Author:** [@RandySea](https://community.purpleair.com/u/RandySea)\ **Replies:** 2\ **Last updated:** [August 15, 2026, 11:54pm UTC](https://community.purpleair.com/t/how-to-make-us-epa-conversion-the-default/22885 "2026-08-15T23:54:20Z")
I just learned that although my Purple Air readings say US-EPA, I have to also do a conversion every time I open Purple Air to look at a sensor and have a correct reading. Is there no way to make “apply conversion” a de… --- ## [The New PurpleAir Website](https://community.purpleair.com/t/the-new-purpleair-website/22872)
**Author:** [@PurpleAir](https://community.purpleair.com/u/PurpleAir)\ **Replies:** 1\ **Last updated:** [August 12, 2026, 3:39am UTC](https://community.purpleair.com/t/the-new-purpleair-website/22872 "2026-08-12T03:39:25Z")
Hello PurpleAir community! We recently pushed out a big update to our platforms, and we’d like to provide a brief overview of what’s new, as well as some clarification regarding new and existing systems. You can also tak… --- ## [Discrepancy with Nearby Sensor](https://community.purpleair.com/t/discrepancy-with-nearby-sensor/22863)
**Author:** [@Shipuser](https://community.purpleair.com/u/Shipuser)\ **Replies:** 5\ **Last updated:** [August 10, 2026, 10:01pm UTC](https://community.purpleair.com/t/discrepancy-with-nearby-sensor/22863 "2026-08-10T22:01:39Z")
I have just installed a new sensor in our backyard, the location is less than 1/2 mile from an existing sensor located near the main road through our town. Our sensor reads much higher than the sensor in town: currently … --- ## [Sensor JSON Documentation](https://community.purpleair.com/t/sensor-json-documentation/6917)
**Author:** [@PurpleAir](https://community.purpleair.com/u/PurpleAir)\ **Replies:** 8\ **Last updated:** [August 10, 2026, 5:48pm UTC](https://community.purpleair.com/t/sensor-json-documentation/6917 "2026-08-10T17:48:44Z")
This list contains definitions for fields that can be obtained from a sensor’s local JSON data. Many of these fields are also the same as the information recorded to the SD card. This documentation is current for the 7.0… --- ## [Retrieving specific fields](https://community.purpleair.com/t/retrieving-specific-fields/22878)
**Author:** [@DuaneW](https://community.purpleair.com/u/DuaneW)\ **Replies:** 1\ **Last updated:** [August 9, 2026, 7:33pm UTC](https://community.purpleair.com/t/retrieving-specific-fields/22878 "2026-08-09T19:33:46Z")
I have an API key and I want to get data for a specific sensor whose index I know. If I paste this into my browser, I get results for all fields: https://api.purpleair.com/v1/sensors/319066?api\_key=… But, I don’t want… --- ## [US EPA Conversion: AQI 38; Woodsmoke: AQI 18. What's the "real" air quality?](https://community.purpleair.com/t/us-epa-conversion-aqi-38-woodsmoke-aqi-18-whats-the-real-air-quality/22874)
**Author:** [@TMEdelman](https://community.purpleair.com/u/TMEdelman)\ **Replies:** 0\ **Last updated:** [August 8, 2026, 12:38am UTC](https://community.purpleair.com/t/us-epa-conversion-aqi-38-woodsmoke-aqi-18-whats-the-real-air-quality/22874 "2026-08-08T00:38:38Z")
Hi, I can get my home interior to US EPA Conversion 2.5 PM to AQI 12 or so with air purifiers, and I typically close the windows at outside AQI 28. The readings above are for my Zen, outside on the second floor balcony. … --- ## [Is there a field that returns data with US EPA pm2.5 conversion formula applied?](https://community.purpleair.com/t/is-there-a-field-that-returns-data-with-us-epa-pm2-5-conversion-formula-applied/4593)
**Author:** [@Karen\_Wang](https://community.purpleair.com/u/Karen_Wang)\ **Replies:** 16\ **Last updated:** [March 4, 2026, 8:45pm UTC](https://community.purpleair.com/t/is-there-a-field-that-returns-data-with-us-epa-pm2-5-conversion-formula-applied/4593 "2026-03-04T20:45:46Z")
Hello, I was trying to pull sensor data for pm2.5 using the API. I noticed that there’s an option to apply US EPA conversion formula to the data directly in the data layer on the website. However, I did not find a corres… --- ## [FreeAir - Android widgets for PurpleAir](https://community.purpleair.com/t/freeair-android-widgets-for-purpleair/22830)
**Author:** [@Sean\_Colombo](https://community.purpleair.com/u/Sean_Colombo)\ **Replies:** 13\ **Last updated:** [August 7, 2026, 6:27pm UTC](https://community.purpleair.com/t/freeair-android-widgets-for-purpleair/22830 "2026-08-07T18:27:47Z")
Wanted to share that I’ve made a free Android widget for PurpleAir sensors: FreeAir android widget for PurpleAir. I’ve wanted this for a while and recently retired, so I put it together. I’d love to hear your thoughts! … --- ## [Basic data analysis?](https://community.purpleair.com/t/basic-data-analysis/3742)
**Author:** [@spike](https://community.purpleair.com/u/spike)\ **Replies:** 1\ **Last updated:** [August 6, 2026, 8:20pm UTC](https://community.purpleair.com/t/basic-data-analysis/3742 "2026-08-06T20:20:44Z")
Hi, does anyone have instructions for basic data analysis? I’ve been told pivot tables would help me compare weekday and weekend data at a site, but I’m also interested in comparing two sites during the same time period.… --- ## [Map is displaying incorrect value](https://community.purpleair.com/t/map-is-displaying-incorrect-value/22864)
**Author:** [@Caprichoso](https://community.purpleair.com/u/Caprichoso)\ **Replies:** 0\ **Last updated:** [August 4, 2026, 5:45am UTC](https://community.purpleair.com/t/map-is-displaying-incorrect-value/22864 "2026-08-04T05:45:08Z")
My PurpleAir PA-II-SD × 1 outdoor sensor wasn’t working for a while due to a failed power supply. Replaced the power supply and now it is showing 0 on the map. When I click on it on the map the graph is showing complet… [Next page](https://community.purpleair.com/latest.md?page=1)