TAILIEUCHUNG - Participatory Air Pollution Monitoring Using Smartphones

Acid neutralizing capacity (ANC) is a com- monly used chemical indicator of lake or stream sensitivity to acidification. ANC, mea- sured in microequivalents per liter (µeq/L; See Box 3 for a list of chemical units of measure), characterizes the ability of water to neutralize strong acids including those introduced by atmospheric deposition. ANC is a good gen- eral indicator of acidity-related water quality because values are typically strongly correlated with pH, Al +3 concentrations, and Ca +2 con- centrations. Specific concern levels have been identified and are used to estimate critical loads (Table 2). The diversity of fish species declines precipitously with decreases in ANC in Adirondack Lakes (Figure 2). In Shenan- doah National Park (Virginia) streams researchers found that one. | Participatory Air Pollution Monitoring Using Smartphones David Hasenfratz Olga Saukh Silvan Sturzenegger and Lothar Thiele Computer Engineering and Networks Laboratory ETH Zurich Switzerland hasenfratz saukh thiele @ ssilvan@ ABSTRACT Air quality monitoring is extremely important as air pollution has a direct impact on human health. In this paper we introduce a low-power and low-cost mobile sensing system for participatory air quality monitoring. In contrast to traditional stationary air pollution monitoring stations we present the design implementation and evaluation of Gas-Mobile a small and portable measurement system based on off-the-shelf components and suited to be used by a large number of people. Vital to the success of participatory sensing applications is a high data quality. We improve measurement accuracy by i exploiting sensor readings near governmental measurement stations to keep sensor calibration up to date and ii analyzing the effect of mobility on the accuracy of the sensor readings to give user advice on measurement execution. Finally we show that it is feasible to use GasMobile to create collective high-resolution air pollution maps. 1. INTRODUCTION Urban air pollution is a major concern in modern cities and developing countries. Atmospheric pollutants considerably affect human health they are responsible for a variety of respiratory illnesses . asthma and are known to cause cancer if humans are exposed to them for extended periods of time 20 . Additionally air pollution is responsible for environmental problems such as acid rain and the depletion of the ozone layer. Hence air pollution monitoring is of utmost importance. State-of-the-art air quality monitoring. Nowadays air pollution is monitored by networks of static measurement stations operated by official authorities. These stations are highly reliable and can accurately measure a wide range of air pollutants using traditional analytical instruments such as mass

• Môi trường
• Laboratory Infectious Animals
• Mathematical Modeling
• IL 2 Based Immune
• Cell Homeostasis
• Oxidative Stress
• Health and Disease
• Thyroid Cancer
• Glycosylation and Glycoproteins
• Potential Role
• Acknowledgements