A5015091639- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Atmospheric chemistry and aerosols
- Fire effects on ecosystems
- Fire Detection and Safety Systems
- Atmospheric aerosols and clouds
- Wind and Air Flow Studies
- Environmental and Social Impact Assessments
- COVID-19 impact on air quality
- Evacuation and Crowd Dynamics
- Water Quality Monitoring Technologies
- Atmospheric and Environmental Gas Dynamics
- Climate Change and Health Impacts
- Fire dynamics and safety research
- Water Quality Monitoring and Analysis
- Aeolian processes and effects
- Environmental Justice and Health Disparities
- Smart Materials for Construction
- Remote Sensing and LiDAR Applications
- Urban Transport and Accessibility
- Meteorological Phenomena and Simulations
- 3D Surveying and Cultural Heritage
- Optical Wireless Communication Technologies
University of California, Berkeley
2021-2023
The University of Texas at Austin
2019
City College
2018
City College of New York
2017-2018
Significance Wildfires are an increasingly large source of particulate matter (PM 2.5 ) in the western United States. Previous characterizations exposure to wildfire smoke particles were based mainly on outdoor concentrations PM . Since people shelter indoors during events, infiltration into buildings determines exposure. We present analysis more than 1,400 California using 2.4 million sensor hours data from PurpleAir network. Our study reveals that days was substantially reduced compared...
New Delhi, India is the most polluted megacity in world and routinely experiences high particulate matter (PM) concentrations. As part of Delhi Aerosol Supersite Study, we have been measuring PM1 concentration composition continuously since January 2017. This paper focuses on autumn, one seasons when concentrations steadily increase throughout season can exceed 1000 μg m–3 during episodic events. Positive matrix factorization organic aerosol (OA) spectrum suggests comparable seasonal average...
We assess impacts of the 2020 COVID-19 lockdown on ambient air quality in Delhi, building over three years real-time measurements black carbon (BC) and nonrefractory submicrometer aerosol (NR-PM1) composition from Delhi Aerosol Supersite public data regulatory monitoring network. performed source apportionment organic (OA) robust statistical analyses to differentiate lockdown-related baseline seasonal interannual variability. The primary pollutants NOx, CO, BC were most reduced, primarily...
Abstract. Lower-cost air pollution sensors can fill critical quality data gaps in India, which experiences very high fine particulate matter (PM2.5) but has sparse regulatory monitoring. Challenges for low-cost PM2.5 India include high-aerosol mass concentrations and pronounced regional seasonal gradients aerosol composition. Here, we report on a detailed long-time performance evaluation of popular sensor, the Purple Air PA-II, at multiple sites India. We established three distinct across...
<p>Wildfires have become the dominant source of particulate matter (PM<sub>2.5</sub>, < 2.5 µm diameter) leading to unhealthy air quality index occurrences in western United States. Since people mainly shelter indoors during wildfire smoke events, infiltration PM<sub>2.5 </sub>into indoor environments is a key determinant human exposure, and potentially controllable with appropriate awareness, infrastructure investment, public education. Using time-resolved...
Abstract. We report on the long-term performance of a popular low-cost PM2.5 sensor, PurpleAir PA-II, at multiple sites in India, with aim identifying robust calibration protocols. established 3 distinct India (North India: Delhi, Hamirpur; South Bangalore), where we collocated PA-II reference beta-attenuation monitors to characterize sensor and model relationships between PA-IIs for hourly data. Our remained operation across all major seasons India. Without calibration, had high precision...
National-scale linear regression-based modeling may mischaracterize localized patterns, including hyperlocal peaks and neighborhood- to regional-scale gradients. For studies focused on within-city differences, this mischaracterization poses a risk of exposure misclassification, affecting epidemiological environmental justice conclusions.
The complexity of urban boundary layer dynamics poses challenges to those responsible for the design and regulation buildings structures in environment. Lidar systems New York City Metropolitan region have been used extensively study dynamics. These systems, conjunction with other sensing platforms can provide an observatory perform research analysis turbulent inclement weather patterns interest developers agencies.
<p>Wildfires have become the dominant source of particulate matter (PM<sub>2.5</sub>, < 2.5 µm diameter) leading to unhealthy air quality index occurrences in western United States. Since people mainly shelter indoors during wildfire smoke events, infiltration PM<sub>2.5 </sub>into indoor environments is a key determinant human exposure, and potentially controllable with appropriate awareness, infrastructure investment, public education. Using time-resolved...
Wildfires have become the dominant source of particulate matter (PM 2.5 , < µm diameter) leading to unhealthy air quality index occurrences in western United States. Since people mainly shelter indoors during wildfire smoke events, infiltration PM into indoor environments is a key determinant human exposure, and potentially controllable with appropriate awareness, infrastructure investment, public education. Using time-resolved observations outside inside over 1400 buildings from...
Wildfires have become the dominant source of particulate matter (PM 2.5 , < µm diameter) leading to unhealthy air quality index occurrences in western United States. Since people mainly shelter indoors during wildfire smoke events, infiltration PM into indoor environments is a key determinant human exposure, and potentially controllable with appropriate awareness, infrastructure investment, public education. Using time-resolved observations outside inside over 1400 buildings from...
In this study, multiple remote sensing and in-situ measurements are combined in order to obtain a comprehensive understanding of the aerosol distribution New York City. Measurement horizontal aerosols is performed using scanning eye-safe elastic-backscatter micro-pulse lidar. Vertical measured with co-located ceilometer. Furthermore, our analysis also includes particulate matter wind speed direction. These observations show boundary layer dynamics as well transport inhomogeneous spatial...