Does air pollution modify temperature-related mortality? A systematic review and meta-analysis

Area of Science:

• Environmental Health
• Epidemiology
• Toxicology

Background:

• Growing evidence suggests air pollutants may alter temperature-health relationships.
• Previous studies yielded inconsistent findings on this interaction.
• A comprehensive understanding of air pollutant modification of temperature-health effects is needed.

Purpose of the Study:

• To synthesize current evidence on how air pollutants modify temperature-health outcome relationships.
• To provide a comprehensive understanding of these complex interactions.
• To inform public health policies and interventions.

Main Methods:

• Systematic literature search across major databases (PubMed, EMBASE, Web of Science, ProQuest).
• Quality and strength of evidence evaluated using the modified Navigation Guide.
• Meta-analysis of temperature-related mortality under varying air pollutant levels (low vs. high).

Main Results:

• Particulate Matter (PM10) and Ozone (O3) significantly modified heat effects on all-cause and non-accidental mortality.
• Higher PM10 and O3 levels were associated with increased excess risks for mortality.
• Unexpectedly, high Carbon Monoxide (CO) levels showed a reduced heat effect on cardiovascular mortality.
• No significant modification of heatwave or cold effects by air pollutants was observed.

Conclusions:

• PM10 and O3 are key modifiers of heat-related mortality, necessitating their inclusion in heat-health warning systems.
• Public health strategies should integrate air quality data for effective heat risk management.
• Further research with standardized methodologies is recommended to confirm findings.