Clinical Scorecard: Temporal and Spatial Correlation Between COVID-19 Cases and Mortality Rates and Exposure to Particulate Matter from Wildfires in 2020
At a Glance
Category
Detail
Condition
COVID-19 infection and mortality
Key Mechanisms
Exposure to wildfire smoke particulate matter (PM2.5) increases COVID-19 cases and deaths via respiratory and systemic effects; PM2.5 may act as a carrier for pathogens and exacerbate respiratory disease
Target Population
California county populations during 2020 wildfire season
Care Setting
Public health and epidemiological surveillance at county level
Key Highlights
A 1-month lag increase of 203 COVID-19 cases and 2.75 deaths per 10,000 persons per 10 µg/m3 increase in wildfire smoke PM2.5 was observed.
The association attenuated at 2 months with fewer cases and no significant increase in deaths.
Wildfire smoke PM2.5 exposure likely contributed to increased COVID-19 spread and mortality during California's 2020 wildfire season.
Guideline-Based Recommendations
Diagnosis
Consider environmental exposure history, including recent wildfire smoke exposure, in assessing COVID-19 risk.
Management
Implement public health measures to reduce exposure to wildfire smoke during pandemics.
Enhance respiratory protection and air quality interventions in wildfire-affected areas.
Monitoring & Follow-up
Monitor PM2.5 levels from wildfire smoke as a factor influencing COVID-19 case surges and mortality.
Use spatial autoregressive models to account for spatial autocorrelation in infectious disease surveillance.
Risks
Increased wildfire smoke PM2.5 exposure elevates risk of COVID-19 infection and death.
PM2.5 exposure exacerbates respiratory and cardiovascular conditions, compounding COVID-19 severity.
Patient & Prescribing Data
General population in wildfire-affected counties during 2020
No direct prescribing data; findings support preventive measures to reduce smoke exposure to mitigate COVID-19 impact.
Clinical Best Practices
Incorporate environmental pollution data, especially wildfire smoke PM2.5, into COVID-19 risk assessments.
Advocate for policies to reduce wildfire smoke exposure during infectious disease outbreaks.
Use spatial modeling techniques to better understand and predict disease spread influenced by environmental factors.
by Thomas C McHale, David R Boulware, Kelly Searle, Leda Kobziar, Phinehas Lampman, Julio C Zuniga-Moya, Ben Papadopoulos, Andrej Spec, Naomi E Hauser, George R Thompson
