Publications by authors named "Hannah S Halliday"
Article Synopsis
- Wildfires are a growing contributor to air pollution, particularly due to reactive organic compounds (ROC), which have varying health impacts based on their toxicity and abundance.
- A study combining field campaign data and air quality modeling found that current emissions estimates capture only 40-45% of the total ROC released from wildfires.
- The research indicates that particulate ROC could significantly affect health risks from smoke exposure, highlighting the need for more accurate toxicity data on these compounds.
During wildfire smoke events public health agencies release advisories to stay indoors, close doors and windows, and operate a portable air cleaner (PAC). The do-it-yourself (DIY) air cleaner consisting of a box fan and a furnace filter is a widely used low-cost alternative to commercial PACs because of its increased accessibility. In this study, we evaluate the clean air delivery rate (CADR) of different DIY air cleaner designs for reducing simulated wildfire smoke and identify operating parameters that may impact their performance and use.
View Article and Find Full Text PDFCarbonaceous emissions from wildfires are a dynamic mixture of gases and particles that have important impacts on air quality and climate. Emissions that feed atmospheric models are estimated using burned area and fire radiative power (FRP) methods that rely on satellite products. These approaches show wide variability and have large uncertainties, and their accuracy is challenging to evaluate due to limited aircraft and ground measurements.
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- The Korea - United States Air Quality Study (2016) investigated the sources of high ozone and aerosol levels in South Korea through aircraft and ground measurements focused on particulate matter (PM) smaller than 2.5 micrometers.
- The study analyzed PM data to understand conditions leading to air quality standard violations, especially in the Seoul area, and examined the interaction between meteorological factors and aerosol concentrations.
- It identified two key meteorological periods influencing PM levels: stagnant clear conditions, which boosted local aerosol production, and cloudy, humid conditions that accelerated aerosol production from both local and transported emissions, suggesting the need for more continuous monitoring to better understand these dynamics.
The current network of ground-based monitors for ozone (O) is limited due to the spatial heterogeneity of O at the surface. Satellite measurements can provide a solution to this limitation, but the lack of sensitivity of satellites to O within the boundary layer causes large uncertainties in satellite retrievals at the near-surface. The vertical variability of O was investigated using ozonesondes collected as part of NASA's eriving nformation on urface Conditions from lumn and tically Resolved Observations Relevant to ir uality (DISCOVER-AQ) campaign during July 2011 in the Baltimore, MD/Washington D.
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