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Until recently, air quality impacts from wildfires were predominantly determined using the Air Quality Index (AQI), calculated from data from permanent stationary regulatory air pollution monitors. However, low-cost particulate matter (PM) sensors are now being widely used by the...

Background: Wildland fire (wildfire; bushfire) pollution contributes to poor air quality, a risk factor for premature death. The frequency and intensity of wildfires are expected to increase; improved tools for estimating exposure to fire smoke are vital. New-generation satellite...

Real-time water distribution system (WDS) hydraulic models is being used in water utilities. The hydraulic models must be calibrated carefully before they are in use. Most existing calibration methods either require substantial computation resources or lack flexibility to link th...

Wildland fires can emit substantial amounts of air pollution that may pose a risk to those in proximity (e.g., first responders, nearby residents) as well as downwind populations. Quickly deploying air pollution measurement capabilities in response to incidents has been limited t...

Analysis of formaldehyde measurements by the Pandora spectrometer systems between 2016 and 2019 suggested that there was a temperature dependent process inside Pandora head sensor that emitted formaldehyde. Some parts in the head sensor were manufactured from thermal plastic poly...

The use of air sensor technology is increasing worldwide for a variety of applications, however, with significant variability in data quality. The United States Environmental Protection Agency held a workshop in July 2019 to deliberate possible performance targets for air sensors...

The Jack Rabbit II Special Sonic Anemometer Study (JRII-S), a field project designed to examine the flow and turbulence within a systematically arranged mock-urban environment constructed from CONEX shipping containers, is described in detail. The study involved the deployment of...

This paper presents a greedy optimization algorithm for sensor placement to calibrate a water distribution system (WDS) hydraulic model more efficiently. The proposed approach improves the calibration accuracy by optimizing sensor placement. An optimally located sensor not only o...

Advances in air pollution sensor technology have enabled the development of small and low cost systems to measure outdoor air pollution. The deployment of a large number of sensors across a small geographic area would have potential benefits to supplement traditional monitoring n...

Adverse human health effects including cardiovascular and respiratory effects and premature mortality are linked to human exposures to ambient concentrations of particulate matter (PM), including particulate matter with aerodynamic diameter of 2.5 µm or less (PM2.5). Anthropogeni...

Air quality is a growing public concern in both developed and developing countries, as is the public interest in having information on air pollutant concentrations within their communities. Quantifying the spatial and temporal variability of ambient fine particulate matter (PM2.5...

From June 2013 to March 2015, a total of 41 two-week duration passive sampler deployments were conducted at 17 sites in South Philadelphia, with results for benzene discussed here. Complementary time-resolved measurements with lower cost prototype fenceline sensors and an open-pa...

Product Description: Industrial facilities have the potential to emit volatile organic compounds (VOCs), hazardous air pollutants (HAPs), and odorous species from unintended sources including fugitive leaks, process malfunctions, and improperly controlled operations. Stochastic i...

An emission sensor/sampler system was coupled to a NASA hexacopter unmanned aerial system (UAS) to characterize gases and particles in the plume emitted from open burning of military ordnance. The UAS/sampler was tested at two field sites resulting in 33 flights at Radford, VA a...

Characterizing highly dynamic, transient, and vertically lofted emissions from open area sources poses unique measurement challenges. This study developed and applied a multipollutant sensor and integrated sampler system for use on mobile applications including tethered balloons ...

Increased availability of commercially-available low cost air quality sensors combined with increased interest in their use by citizen scientists, community groups, and professionals has resulted in a flood of journal articles summarizing their use. Even so, the US EPA's SPEAR r...

Air quality data from satellites and low-cost sensors, along with output from air quality models, have the potential to augment high quality, regulatory-grade data in countries with in situ monitoring networks and provide much needed air quality information in countries without t...

This perspectives article assesses the current state of air monitoring in low and middle income countries (LMICs) and concludes with the following specific recommendations: 1) Provide clear, informed guidance to LMICs on purchasing and deploying low-cost sensor devices, alongside...

Air monitoring is desirable in many places to understand dynamic pollution trends and sources and improve knowledge of population exposure. While highly miniaturized low cost sensor technology is quickly evolving, there is also a need for the advancement of mid-tier systems that ...

Background: Lower-cost air quality sensors (hundreds to thousands of dollars) are now available to individuals and communities. This technology is undergoing a rapid and fragmented evolution, resulting in sensors that have uncertain data quality, measure different air pollutant...

The United States Environmental Protection Agency held an international two-day workshop in June 2018 to deliberate possible performance targets for non-regulatory fine particulate matter (PM2.5) and ozone (O3) air sensors. The need for a workshop arose from the lack of any marke...

Live-cell imaging using genetically encoded fluorogenic reporters of the intracellular glutathione redox potential and hydrogen peroxide is an experimental approach that offers unparalleled spatiotemporal resolution, sensitivity, and specificity while avoiding many of the shortco...

A citizen science led effort conducted between October 2016 -February 2017 collected real-time measurements of the particulate matter size fraction 2.5 micron (PM2.5) and nitrogen dioxide (NO2) across eight locations in an area of Puerto Rico (Tallaboa-Encarnaci&oacute;n, Pe&nti...

Communication's Highlight. The U.S. EPA in collaboration with the Economic Council of States (ECOS), and with the assistance of numerous national and international air quality experts, conducted the Air Sensors 2018: Deliberating Performance Targets Workshop (June 25-26th, 2018...

Air pollution sensors are quickly proliferating for use in a wide variety of applications, with a low price point that supports use in high-density networks, citizen science, and individual consumer use. This emerging technology motivates the assessment under real-world condition...