Indoor Air Quality Ozone Monitor
We are in the process of developing a portable IAQ Ozone Monitor to address the needs of indoor air quality measurements. The goal is to produce an ozone monitor based on UV absorbance that is free from interferences often found in indoor air while being priced at the same level as currently available Heated Metal Oxide Semiconductor (HMOS) ozone sensors which suffer from many interferences and long-term drift. A new product, the UV-IAQ Ozone Monitor, is undergoing field testing in late 2017. The instrument features the use of fans in place of air pumps to make the instrument nearly silent for use indoors, and a patent-pending heated graphite ozone scrubber to greatly reduce interferences from Hg and UV-absorbing VOCs found indoors.
Black Carbon Photometer
We are in the process of developing a long-path, direct-absorbance instrument for measuring total extinction of aerosols at multiple wavelengths in the visible and near IR. In combination with a miniature integrating nephelometer to quantify the scattering component of extinction, this instrument will be capable of measuring total particle absorbance by difference. Our goal is to develop a portable instrument that can replace Aethalometers, which rely on collection of particle on filters. Of course, an important application is field measurements of the fundamental radiative properties of aerosols.
In a Phase I SBIR grant funded by the National Institute for Environmental Health Sciences (NIEHS) of the National Institutes of Health (NIH), students at 50 schools throughout the U.S. were provided with Personal Ozone Monitors and microAeth personal black carbon monitors. In this program, first called GO3 Treks and now called AQTreks, students planned and carried out personal exposure monitoring treks in their communities. The data were uploaded to a database and displayed on Google Earth embedded in blogs where students discuss their results. . In the Phase II project, we developed new hand-held instruments for air pollution measurements (CO, CO2, and particulate matter) with the ability to upload data to a database and display those data in real time on multiple smart phones. Use of these new Personal Air Monitors in schools began in Fall 2017. The project is described here. Although these instruments are being developed for use in the AQTreks project, they may be used in any application where personal monitoring of these species is desired.