In 2013 the World Health Organization estimated 3.7 million premature deaths were caused by outdoor air pollution, and about 90% of these cases were reported in low- and middle-income communities. The primary air pollutant in these areas are small airborne particulate matter of 10 microns or less in diameter (PM10). PM10 can penetrate and lodge deep inside human lungs and can contribute to the development of cardiovascular and respiratory diseases, as well as lung cancer. In cases like this, it might be desirable to have a personal system for low-cost air quality sensing of airborne particulate matter like PM10. While there are several consumer-level options for personal air monitoring on the market today, their everyday use is limited in terms of size, cost, reliability, and power. To help address these problems, researchers at the University of California, Berkeley have developed systems, software, and methods towards an ultra-portable, high-performance, low-cost mobile air quality sensing platform. The research is ongoing and investigators have demonstrated strong proof of concept, with accurate detections with known air samples consisting of fine (<2.5 micron) and coarse (2.5-10 micron) particle sizes. The Berkeley system and methods hold promise in helping make personal air quality monitoring more accessible for at-risk populations, where health concerns and air quality are most contentious and misrepresented.