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Records 1 to 25 of 280

Beyond Particulate Matter Mass: Heightened Levels of Lead and Other Pollutants Associated with Destructive Fire Events in California
(JOURNAL) [Published : Oct 18, 2022]
Abstract: As the climate warms, wildfires are increasing in size and intensity, posing a risk to human health and sensitive ecosystems. Studies have reported on particulate matter (PM) in wildfire smoke; however, the chemicals associated with PM, including toxic metals, have rece...
Promoting risk reduction among young adults with asthma during wildfire smoke
(JOURNAL) [Published : Apr 01, 2022]
Objective(s) This study explored the feasibility, acceptability, preliminary impact, and functionality of two risk reduction mobile application (app) interventions on asthma outcomes as compared to a control arm during wildfire season. Design Three-arm, 8-week randomized clinic...
Fuel layer specific pollutant emission factors for fire prone forest ecosystems of the western U.S. and Canada
(JOURNAL) [Published : Sep 21, 2022]
Wildland fires are a major source of gases and aerosols, and the production, dispersion, and transformation of fire emissions have significant ambient air quality impacts and climate interactions. The increase in the wildfire area burned and severity across the US and Canada in r...
Comprehensive evaluations of diurnal NO2 measurements during DISCOVER-AQ 2011: effects of resolution-dependent representation of NOx emissions
(JOURNAL) [Published : Jul 23, 2021]
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,...
Linking multi-media modeling with machine learning to assess and predict lake chlorophyll a concentrations
(JOURNAL) [Published : Dec 13, 2021]
Eutrophication and excessive algal growth pose a threat on aquatic organisms and the health of the public, environment, and the economy. Understanding what drives excessive algal growth can inform mitigation measures and aid in advance planning to minimize impacts....
Environmental effects of stratospheric ozone depletion, UV radiation, and interactions with climate change: UNEP Environmental Effects Assessment Panel, Update 2021
(JOURNAL) [Published : Feb 21, 2022]
The Environmental Effects Assessment Panel of the Montreal Protocol under the United Nations Environment Programme evaluates effects on the environment and human health that arise from changes in the stratospheric ozone layer and concomitant variations in ultraviolet (UV) radiati...
Emissions of Carbonaceous Particulate Matter and Ultrafine Particles from Vehicles—A Scientific Review in a Cross-Cutting Context of Air Pollution and Climate Change
(JOURNAL) [Published : Apr 02, 2022]
Airborne particulate matter (PM) is a pollutant of concern not only because of its adverse effects on human health but also on visibility and the radiative budget of the atmosphere. PM can be considered as a sum of solid/liquid species covering a wide range of particle sizes with...
Flexible Bayesian Ensemble Machine Learning Framework for Predicting Local Ozone Concentrations
(JOURNAL) [Published : Apr 05, 2022]
3D-grid-based chemical transport models, such as the Community Multiscale Air Quality (CMAQ) modeling system, have been widely used for predicting concentrations of ambient air pollutants. However, typical horizontal resolutions of nationwide CMAQ simulations (12 × 12 km2) ...
Cleaner air reveals growing influence of climate on dissolved organic carbon trends in northern headwaters
(JOURNAL) [Published : Sep 21, 2021]
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...
A Comparative Study of Two-way and Offline Coupled WRF v3.4 and CMAQ v5.0.2 over the Contiguous U.S.: Performance Evaluation and Impacts of Chemistry-Meteorology Feedbacks on Air Quality
(JOURNAL) [Published : Nov 26, 2021]
The two-way coupled Weather Research and Forecasting and Community Multiscale Air Quality (WRF-CMAQ) model has been developed to more realistically represent the atmosphere by accounting for complex chemistry–meteorology feedbacks. In this study, we present a comparative an...
Synthesis and Hydrolysis of Atmospherically Relevant Monoterpene-Derived Organic Nitrates
(JOURNAL) [Published : Nov 02, 2021]
The partition of gas-phase organic nitrates (ONs) to aerosols and subsequent hydrolysis are regarded as important loss mechanisms for ON species. However, the hydrolysis mechanisms and the major factors controlling the hydrolysis lifetime are not fully understood. In this work, w...
Modeling future asthma attributable to fine particulate matter (PM2.5) in a changing climate: a health impact assessment.
(JOURNAL) [Published : Jan 10, 2022]
Exposure to fine particulate matter (PM2.5) is associated with asthma development as well as asthma exacerbation in children. PM2.5 can be directly emitted or can form in the atmosphere from pollutant precursors. PM2.5 emitted and formed in the atmosphere is influenced ...
Rates and Yields of Unimolecular Reactions Producing Highly Oxidized Peroxy Radicals in the OH-Induced Autoxidation of α-Pinene, β-Pinene, and Limonene
(JOURNAL) [Published : Jan 13, 2022]
Recent ambient atmospheric measurements have detected highly oxygenated organic molecules (HOMs) at many sites and are a consequence of autoxidation processes occurring at ambient temperatures. Monoterpenes in particular have a propensity to autoxidize although they exhibit a wid...
Chemistry, lung toxicity and mutagenicity of burn pit smoke-related particulate matter
(JOURNAL) [Published : Dec 16, 2021]
Background: Open burning of anthropogenic sources can release hazardous emissions and has been associated with increased prevalence of cardiopulmonary health outcomes. Exposure to smoke emitted from burn pits in military bases has been linked with respiratory illness among milit...
Regional Temperature-Ozone Relationships Across the U.S. Under Multiple Climate and Emissions Scenarios
(JOURNAL) [Published : Oct 05, 2021]
The potential effects of 21st century climate change on ozone (O3) concentrations in the United States are investigated using global climate simulations to drive higher-resolution regional meteorological and chemical transport models. Community Earth System Model (CESM) and Coupl...
Estimating PM2.5-related premature mortality and morbidity associated with future wildfire emissions in the Western U.S.
(JOURNAL) [Published : Mar 08, 2021]
The annual number and size of wildfires in the western United States have been increasing;.recent trends are a significant departure from historic wildfire regimes and are significantly correlated with human-induced climate change. Wildfire smoke degrades air quality both near f...
Solar UV radiation in a changing world: roles of cryosphere–land–water–atmosphere interfaces in global biogeochemical cycles
(JOURNAL) [Published : Feb 27, 2019]
Global change influences biogeochemical cycles within and between environmental compartments (i.e., the cryosphere, terrestrial and aquatic ecosystems, and the atmosphere). A major effect of global change on carbon cycling is altered exposure of natural organic matter (NOM) to so...
Assessment of NO2 Observations during DISCOVER-AQ and KORUS-AQ Field Campaigns
(JOURNAL) [Published : May 19, 2020]
NASA’s Deriving Information on Surface Conditions from Column and Vertically Resolved Observations Relevant to Air Quality (DISCOVER-AQ, conducted in 2011–2014) campaign in the United States and the joint NASA and National Institute of Environmental Research (NIER) Korea–United S...
Impacts of a large boreal wildfire on ground level atmospheric concentrations of PAHs, VOCs and ozone
(JOURNAL) [Published : Apr 01, 2018]
During May 2016 a very large boreal wildfire burned throughout the Athabasca Oil Sands Region (AOSR) in central Canada, and in close proximity to an extensive air quality monitoring network. This study examines speciated 24-h integrated polycyclic aromatic hydrocarbon (PAH) and v...
Examining the impacts of increased corn production on groundwater quality using a coupled modeling system
(JOURNAL) [Published : May 15, 2017]
This study demonstrates the value of a coupled chemical transport modeling system for investigating groundwater nitrate contamination responses associated with nitrogen (N) fertilizer application and increased corn production. The coupled Community Multiscale Air Quality Bidirect...
A framework for expanding aqueous chemistry in the Community Multiscale Air Quality (CMAQ) model version 5.1
(JOURNAL) [Published : Apr 13, 2017]
This paper describes the development and implementation of an extendable aqueous-phase chemistry option (AQCHEM − KMT(I)) for the Community Multiscale Air Quality (CMAQ) modeling system, version 5.1. Here, the Kinetic PreProcessor (KPP), version 2.2.3, is used to generate a Rosen...
Does temperature nudging overwhelm aerosol radiative effects in regional integrated climate models?
(JOURNAL) [Published : Apr 03, 2017]
For over two decades, data assimilation (popularly known as nudging) methods have been used for improving regional weather and climate simulations by reducing model biases in meteorological parameters and processes. Similar practice is also popular in many regional integrated met...
Nitrate radicals and biogenic volatile organic compounds: oxidation, mechanisms, and organic aerosol
(JOURNAL) [Published : Feb 13, 2017]
Oxidation of biogenic volatile organic compounds (BVOC) by the nitrate radical (NO3) represents one of the important interactions between anthropogenic emissions related to combustion and natural emissions from the biosphere. This interaction has been recognized for more than 3 d...
Environmental effects of ozone depletion and its interactions with climate change: Progress report, 2016
(JOURNAL) [Published : Jan 26, 2017]
When considering the effects of climate change, it has become clear that processes resulting in changes in stratospheric ozone are more complex than previously believed. As a result of this, human health and environmental issues will be longer-lasting and more regionally variable...
Establishing the Suitability of the Model for Prediction Across Scales for Global Retrospective Air Quality Modeling
(JOURNAL) [Published : May 27, 2021]
The U.S. EPA (United States Environmental Protection Agency) is leveraging recent advances in meteorological modeling to construct an air quality modeling system to allow consistency from global to local scales. The Model for Prediction Across Scales¿Atmosphere (MPAS&iques...