Read our new blog to learn how to answer these Q's: Should I use the 1 or 2 L/min PM2.5 inlet? What's the lowest PM concentration I'll be able to quantify given my sample LOD, flow rate, & duration? How long will it take to collect a sample mass > my LOD? www.accsensors.com/blog/estimat...

Estimating sample mass

A blog post describing procedures for estimating the mass of particulate matter that will be collected during a sample.

accsensors.com

Our latest blog post includes guidance for performing quality assurance (QA) checks on particulate matter samples. Some of this advice is specific to working with the UPAS or Home Health Box, but most of these QA steps apply to samples collected with any instrument. www.accsensors.com/blog/qa

Sample quality assurance

A blog post that describes how to perform quality assurance checks on filter-based particulate matter samples.

accsensors.com

What do I do with this filter cartridge opening tool? youtube.com/shorts/6l4E3...

Using AST's Filter Cartridge Opening Tool

YouTube video by Access Sensor Technologies

youtube.com

Looking for advice on how to check the UPAS sample flow rate against an external flow meter? Check out our new video on YouTube! youtu.be/WA94fYv0oaU

How to check the UPAS sample flow rate against an external flow meter

YouTube video by Access Sensor Technologies

youtu.be

We’ve released another firmware update for UPAS v2.1 and v2.1 PLUS. We encourage users to update to firmware rev206. Read this blog to learn more about the associated improvements, including expanded microSD card compatibility checks and Power Save mode bug fix. www.accsensors.com/blog/upas-fi...

Thank you to Jess Tryner at Access Sensor Technologies for giving a cool and engaging presentation at the American Association of Aerosol Research earlier this week! We are so excited to continue collaborating together on our new projects in indoor air pollution research.

We’ll be at #AAAR2025 next week!

Closing out an inspiring week at ISEE/ISES 2025 in Atlanta! We are grateful for the chance to connect, share our research, and learn from such an impressive roster of conference attendees. Thanks to all who stopped by our posters. See you next year!

Today at #ISESISEE2025, the following presentations are on studies that used our UPAS: 1. Poster P07-07 2. Poster P15-02 3. Flash Talk FT06-06 at 16:33 in Regency VII

We’ll be at #ISESISEE2025 in Atlanta next week and hope to see you there!

Will my UPAS log files change substantially if I update to the new firmware (rev200)? Nope! The log file format will remain the same. Read any UPAS log file into R using our astr package. Install astr v2.3.0, which we just released along with firmware rev200: www.github.com/accsensors/a...

What’s new in the new UPAS firmware? The UPAS now gets UTC time from the mobile device used to program the sample. No more going outside to get a GPS signal if your UPAS loses track of the time (in most cases, at least)! Read our latest blog post to learn more: www.accsensors.com/blog/new-fir...

Introducing the new UPAS v2.1 and v2.1 PLUS firmware

A blog post describing new features included in a major Ultrasonic Personal Air Sampler (UPAS) firmware update released in 2025.

accsensors.com

We’ve released a new UPAS v2.1 and v2.1 PLUS User Guide that describes operation with the new firmware (rev200+). Download it from our website! Still running an older firmware version (<= rev157)? Don’t worry. The user guide for that firmware is still up too! www.accsensors.com/upasv2.1

UPAS v2.1

The UPAS v2.1 is quiet, wearable, easy-to-use particulate matter sampler that logs time-resolved location, light, motion, T/P/RH, and sample flow data.

accsensors.com

Can I update any UPAS to the new firmware? Any UPAS v2.1 or v2.1 PLUS can be upgraded to firmware rev 200. These devices have serial IDs that start with “PSP”. UPAS v2.0 cannot be upgraded to the new firmware. Which UPAS is which? See our Products page to learn more: www.accsensors.com/products

Access Sensor Technologies: Products

Learn more about our virtually-silent, portable, and easy-to-use air pollution samplers.

accsensors.com

We’ve released a major firmware update for our UPAS v2.1 and v2.1 PLUS. This update makes sample setup easier and UPAS operation more reliable! Read this blog to learn more about what’s new and how to update your UPAS: www.accsensors.com/blog/new-fir... #AirPollution #AirQuality #ParticulateMatter

Introducing the new UPAS v2.1 and v2.1 PLUS firmware

A blog post describing new features included in a major Ultrasonic Personal Air Sampler (UPAS) firmware update released in 2025.

accsensors.com

We’ll be exhibiting at the Air & Waste Management Association Air Quality Measurements Conference in Aurora, CO this week! Come by Booth 12 and say hello! Find out if our UPAS or Home Health Box can fulfill your air sampling needs! #AQMeasurements

We’re looking to hire 1-2 summer interns through the CSU Energy Institute’s Cogen Summer Internship program. Interns will work on R&D activities related to our wearable #airpollution samplers. $25/hour, 40 hr/week for 10 weeks. Apply here by March 2nd: energy.colostate.edu/energy-insti...

Energy Institute Cogen Summer Internship - Energy Institute

The 2022 Cogen Summer Interns and Fellows. This could be you! Energy Institute’s Cogen Summer Internship Summer 2025May-August The Energy Institute is partnering with local companies to create interns...

energy.colostate.edu

Published today! Hundreds of 24h personal & indoor PM2.5 & PM10 measurements collected at 2 LPM with UPAS compared to samples collected with PMIs + Apex2 pumps: Spearman correlation > 0.8, normalized mean difference < 16%. All samples collected in California’s Central Valley. doi.org/10.1080/0278...

Application and validation of a wearable monitor for assessing time- and location-resolved exposures to particulate matter in California’s Central Valley

Reliable assessment of personal exposure to air pollution remains a challenge due to the limitations of monitoring technology. Recent technology developments, such as reductions in the size and cos...

doi.org

Want to write one of these papers? Need some cool new portable instruments to collect the data? Just let us know! #airpollution #airquality

Jon Levy@jonlevybu.bsky.social · 2y ago

By way of introduction, my contribution from a few years back of 12 main types of scientific papers in environmental health #environment #publichealth

We just released a new version of our astr package for reading UPAS and HHB log files into R! What’s new? This version won’t throw an error if you try to read an empty sample log; it will just return a data frame with zero rows. I stall from GitHub! #airquality #Rstats github.com/accsensors/a...

GitHub - accsensors/astr: astr package for R log file analysis

astr package for R log file analysis. Contribute to accsensors/astr development by creating an account on GitHub.

github.com

We just posted an updated UPAS v2.1 and v2.1 PLUS User Guide. What’s new? 1) An improved explanation of what happens when you start a sample from the app 2) advice for preparing the internal Li-ion battery for shipping or long-term storage. Download from this page: www.accsensors.com/upasv2.1plus

UPAS v2.1 PLUS

The UPAS v2.1 PLUS combines a quiet, wearable, easy-to-use particulate matter filter sampler with time-resolved location and pollution sensors.

accsensors.com

You can program the PM sensor in the UPAS v2.1 PLUS to operate on a duty cycle so the UPAS can run longer on a single battery charge. Looking for advice on selecting the best setting for your application? Read our new blog post! #airquality #airpollution www.accsensors.com/blog/duty-cy...

Choosing the best particulate matter sensor duty cycle for your measurement application

Guidance for UPAS v2.1 PLUS users on selecting the best time-resolved particulate matter sensor duty cycle for a specific air sampling application.

accsensors.com

Hello, Bluesky! Want to hear about new publications featuring our products? See blog posts with advice for collecting air samples? Find out about firmware and software updates? Follow us!