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Experimental fenceline sensor pods (SPods) fitted with 30 second duration canister grab sampling (CGS) systems were deployed at a site near chemical facilities in Louisville, KY from June 4, 2018, to January 5, 2020. The objective of the study was to better understand lower cost ...

Startling images of smoke-filled skies have filled the news and social media in recent years during major wildfires in the U.S. (Figure 1). In 2020, over 10 million acres burned from nearly 59,000 wildland fires, including wildfires and prescribed fires (National Interagency Coor...

The COVID-19 pandemic created an extreme natural experiment in which sudden changes in human behavior and economic activity resulted in significant declines in nitrogen oxide (NOx) emissions, immediately after strict lockdowns were imposed. Here we examined the impact of multiple...

Air pollution impacts public health and welfare, especially in the world&rsquo;s larger cities experiencing population growth, urbanization, and increased economic activity. Air pollution (indoor and outdoor) has been attributed to over 7 million deaths per year and numerous illn...

In this study, we contrasted major secondary inorganic species and processes responsible for submicron particle formation (SPF) events in the boundary layer (BL) and free troposphere (FT) over the Korean Peninsula during Korea-United States Air Quality (KORUS-AQ) campaign (May-Ju...

Nitrogen oxides (NOx=NO2NO2) play a crucial role in the formation of ozone and secondary inorganic and organic aerosols, thus affecting human health, global radiation budget, and climate. The diurnal and spatial variations in NO2 are functions of emissions, advection, deposition,...

PurpleAir sensors, which measure particulate matter (PM), are widely used by individuals, community groups, and other organizations including state and local air monitoring agencies. PurpleAir sensors comprise a massive global network of more than 10,000 sensors. Previous perform...

EPA Program, Regional Offices, State, Local, and Tribal organizations have requested information about PFAS air emissions and atmospheric fate and transport to better understand potential human exposures. This product broadly addresses the importance of considering PFAS-related ...

The Lake Michigan Ozone Study 2017 (LMOS 2017) in May and June 2017 enabled study of transport, emissions, and chemical evolution related to ozone air pollution in the Lake Michigan airshed. Two highly instrumented ground sampling sites were part of a wider sampling strategy of a...

Background: Exposure to ambient air pollution is associated with increased cardiovascular morbidity and mortality. Circulating microRNAs (miRNAs) may mediate cardiovascular effects of exposure to air pollution. This study aims to investigate whether circulating miRNAs mediate the...

The convergence of technological innovations in areas such as microelectronics, fabrication, the internet-of-things (IoT), and smartphones, along with their associated &ldquo;apps&rdquo;, permeates many aspects of life. To that list we now can add environmental monitoring. Once t...

Landsat-based land cover database for the conterminous United States. These data are foundational for ORD projects EnviroAtlas and StreamCat/LakeCat and several other EPA projects include annual GHG emissions reported to UNFCCC, Recovery Potential (OW), Healthy watersheds (OW), w...

The growth of industrial and agricultural activities has created increase in environmental pollution worldwide. Environmental pollutants are damaging to the ecosystem and lead to a variety of health issues affecting humans throughout the world regardless of their age, race, and g...

Swiss needle cast (SNC), caused by Nothophaeocryptopus gaeumannii, is a foliage disease of Douglas-fir (Pseudotsuga menziesii), that reduces growth in native and exotic plantations worldwide. An outbreak began in coastal Oregon in the mid-1990&rsquo;s and has persisted since that...

To investigate changes in the ozone (O3) chemical production regime over the contiguous United States (CONUS) with accurate knowledge of concentrations of its precursors, we applied an inverse modeling technique with Ozone Monitoring Instrument (OMI) tropospheric&nbsp;nitrogen di...

We derive the properties and demonstrate the desirability of a model-based method for estimating the spatially varying effects of covariates on a quantile function. By modeling the quantile function as a combination of I-spline basis functions and Pareto tail distributions, we al...

Surface water browning, the result of increasing concentrations of dissolved organic matter (DOM), has been widespread in northern ecosystems in recent decades. Here, we assess a database of 426 undisturbed headwater lakes and streams in Europe and North America for evidence of t...

Background: Exposure to air pollution is associated with elevated cardiovascular risk. Evidence shows that omega-3 polyunsaturated fatty acids (omega-3 PUFA) may attenuate the adverse cardiovascular effects of exposure to fine particulate matter (PM2.5). However, it is unclear wh...

The state-of-the-science Community Multiscale Air Quality (CMAQ) Modeling System has recently been extended for hemispheric-scale modeling applications (referred to as H-CMAQ). In this study, satellite-constrained estimation of the degassing SO2 emissions from 50 volcanos over th...

The emissions of volatile organic compounds (VOCs) and semi-volatile organic compounds (SVOCs) from indoor materials pose an adverse effect on people&rsquo;s health. In this study, a new analytical model was developed to simulate emission behaviors for both VOCs and SVOCs. Based ...

Background: Short-term exposure to ambient nitrogen dioxide (NO2) is associated with adverse respiratory and cardiovascular outcomes. Supplementation of omega-3 polyunsaturated fatty acids (PUFA) has shown protection against exposure to fine particulate matter. This study aims t...

We present in this technical note the research protocol for phase 4 of the Air Quality Model Evaluation International Initiative (AQMEII4). This research initiative is divided into two activities, collectively having three goals: (i) to define the current state of the science wit...

Wildland fire activity and associated emission of particulate matter air pollution is increasing in the United States over the last two decades due primarily to a combination of increased temperature, drought, and historically high forest fuel loading. The regulatory monitoring n...

Personal exposure to volatile organic compounds (VOCs) from indoor sources including consumer products is an understudied public health concern. To develop and evaluate methods for monitoring personal VOC exposures, we performed a pilot study and examined time-resolved sensor-bas...

We present trace gas vertical profiles observed by instruments on the NASA DC-8 and at a ground site during the Korea-US air quality study (KORUS) field campaign in May to June&nbsp;2016. We focus on the region near the Seoul metropolitan area and its surroundings where both anth...