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  JoAnn Choi Pottberg died peacefully on April 13, 2021 in Palo Alto, CA, one day shy of her 80th birthday. Family and friends gathered to celebrate her life and honor her milestone birthday! JoAnn is survived by her husband, Thomas Lee Pottberg; children, Stefania Pomponi of Palo Alto, CA; Peter Pomponi of Eugene, OR; Camille Paldi of Palo Alto, CA; and Jill Paldi and her partner Humberto Bracho of Palo Alto, CA; her grandchildren, Isabella and Massimo (Peter); Anouk, Wallis and Dashiell (Stefania); Paloma and Severin (Jill); and her brother, Cedric Choi, and his wife, Patricia of Honolulu, HI. She is preceded in death by her parents, Wilbert and Flora Choi, and her brother, James Choi. JoAnn was born in Honolulu, HI to Wilbert and Flora Choi. She graduated from Punahou School, and after spending a year at Simmons College in Boston, MA, returned to Hawai’i to finish her Bachelor’s degree in Fine Arts at the University of Hawai’i. JoAnn lived in Rome, Italy; Honolulu, HI, where she ha

Met One Instruments, Inc. ES-405 is your answer...

If you are looking for a lower cost instrument which qualifies as a near-reference monitor, please contact us about the ES-405.  Because reference monitors are expensive and require shelters and limited locations around your state or country, the alternative is a near-reference monitor and lower cost, ease of deployment and maintenance, as well as reliability in comparison with reference type monitors.  Reference type monitors used in the USA are predominantly the Met One Instruments BAM 1020. The BAM 1020 is also deployed around the world in over 130 countries.  Please contact our sales department for more information and pricing at or


  AirNow, and a New Map to Rule Them All Kevin Stark Sep 4, 2020 Save Article Facebook Twitter Email Copy Link Bay Area residents have become used to the ritual of checking air quality maps for places to escape wildfire smoke that has wafted over from burning forests and chapparal near and far. During the 2018 Camp Fire,  AirNow , an air quality website maintained by a partnership of states, the federal government, Canada and Mexico, crashed because it could not handle so many people flocking online to put numbers to what their noses were telling them: The air seems really bad. The failure sent web users  rushing  to alternative, unofficial websites like the interactive, crowdsourced map maintained by  PurpleAir , a manufacturer of low-cost air monitors. But during this year's wildfires, users have noticed a discrepancy between what official sites are reporting and the readings displayed on PurpleAir. So, What’s the Deal? Broadly put, PurpleAir provides more localized, more current


 If you are looking for portability and monitoring, load the 212-2 in your backpack, on your bike, auto, or mount on a pole wherever you wish to monitor. 212-2 ON THE STREETS OF MILAN 212-2 ON THE CANALS IN VENICE

What Do You Need to Monitor Your Site?

Reference, Regulation Monitoring Reference and Regulation monitoring are classified as the highest grade of monitoring instrumentation, given only to those instruments that pass the EPA strict certification requirements. Met One Instruments’ BAM 1020 and BAM 1022 are the dominant Federal Equivalent Method (FEM) products in the US and two of the most successful monitors sold in the world. We also provide both manual and sequential FRM Samplers. The accuracy requirement is ± 10% of the reference standard. Furthermore, an  additional condition exists that the Monitor can operate indefinitely without any site-specific span calibration against a local reference standard .  Met One Instruments, Inc. also offers the E-FRM and the E-SEQ-FRM, which are single-event and multiple-event reference samplers.  BAM-1020 Continuous Particulate Monitor E-FRM Reference Sampler   Personal Exposure Monitoring Personal exposure monitoring may include a wearable sensor or, more typically, a portable sensor l


Facts of The Last Supper in video. Tecnic SAS and Ario Rupprecht have been monitoring The Last Supper since 2008.   Please watch the video to see why dependable and accurate monitoring must be done for the preservation of the painting. The monitors being used are the E-Sampler and the 212-2 Profiler. Happy Easter!

Met One Instruments, Inc., E-SEQ-FRM SAMPLER

Sequential Reference Particulate Sampler for USEPA designated instruments. -All mechanical, non pneumatic -Multi-event, sequential sampling of ambient air onto filter media -US-EPA PM2.5 Reference Method (RFPS-0717-245) -US-EPA-PM10 Reference Method (RFPS-0717-246) -US-EPA PM10-2.5 FRM Reference Method (RFPS-0717-247) -Korea Certification (APSC1-2016-01) -47 mm filter For US-EPA PM2.5 and PM10-2.5 sampling: Teflon 2µm pore size membrane filter (regulation required). For US-EPA PM10 reference sampling Pallflex TX-40 quartz filter and Teflon media -Active flow control for 16.67 LPM. Sampled volume reported under actual and standard conditions -Temperature, barometric pressure and multi-point flow -More than 130 days of interval data with 5 minute time resolution 132 filter records -Keypad/display for data retrieval and programming. RS232, USB serial and USB flash drive interface for data download -Negative 40°C to positive 50°C -100-240 VAC 50/60 Hz 1.4 amps -System/Pump: 14.4 (w) x 14 (

Met One Instruments, Inc. ES-405 for your PM Monitoring Applications

ES-405 Particulate Profiler Ambient 4 Simultaneous Measurements: PM1, PM2.5, PM4, PM10 Fast Deployment Design - Data Reporting Within 2 Minutes After Power Up ​ Measurement Principles: Right angle laser scatter detection. Number of Mass Channels: 4. Particle Channels: 0.3, 0.5, 1.0 ,2.5, 4.0, 5.0, 7.0, and 10.0µm. Minimum Particle Size: 0.3 μm. Accuracy: ±10% to calibration aerosol. Sample Air Flow Rate: 1.0 LPM. Sheath Air Flow Rate: 1.0 LPM. Flow Control: PWM Pump driver. Data Storage Resolution: 1 µg/m3. Data Storage Intervals: User-Selectable 1, 5, 10, 15, 30, or 60 minutes. Laser Type: Diode Laser, 100 mW, 785 nm. Pump Type: 10,000 hour brushless diaphragm sample pump. Power Supply: 10.5-15.5 VDC. Power Consumption: 1.4 0.63amps @ 12 VDC (1 amps (8 Watts)). Operating Temperature: 0 to +50° C. Storage Temperature: -20º to +60º C. User Interface: 4x20 character LCD display, keypad, menu system. Serial Interface: RS-232, RS-485, Modbus, Co


  We are proud to introduce the ES-412 Portable Simultaneous Particulate Profiler to our easy-to-use near-reference instrumentation line of products. As a Near-FEM (Federal Equivalent Method) product,  this lightweight Particulate Profiler offers wireless, remote PM monitoring in a low profile, deployable field instrument. The weatherproof unit measures PM2.5 and PM10 simultaneously with instant access to data on smartphones, tablets, or computers. Data from the ES-412 is backed up internally and then transmitted to a nearby cell tower every 15 minutes. In cell tower communication loss, the ES-412 will attempt communication continuously until it connects again. When this occurs, the ES-412 will transmit all missing data. Transmitted data contains 15-minute averages for PM2.5 and PM10 with information on device power, flow, and internal diagnostics. The custom web page dashboard offers a map showing the unit's location with an internal GPS module. The ES-412 is a system that comes c