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the claim
Increased humidity decreases the environmental survival rate of coronaviruses
the verdict
CONTESTED
the evidence cuts both ways
confidence 49/100

The effect of humidity on the environmental survival of coronaviruses remains contested, with some studies showing that increased humidity and temperature reduce viral viability, while others indicate that survival rates vary non-linearly or depend heavily on surface matrices and absolute humidity.

Evidence for · 3
The Effects of Temperature and Relative Humidity on the Viability of the SARS Coronavirus
2011 · cited by 949
Chan et al. (2011) found that higher relative humidity combined with higher temperature led to rapid loss of viability for SARS-CoV.
Evidence against · 2
Stability of Feline Coronavirus in aerosols and dried in organic matrices on surfaces at various environmental conditions
2023 · cited by 7
Research on Feline Coronavirus (2023) demonstrated higher airborne stability at both low and high relative humidity, with medium relative humidity causing the greatest loss of infectivity.
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More for · 2
Systematic review of the effects of environmental factors on virus inactivation: implications for coronavirus disease 2019
2021 · cited by 25
A systematic review by the authors of (2021) indicated that virus survival and transmission is reduced at intermediate relative humidity but can be complex, though dry conditions aid some survival.
The impact of temperature and relative humidity on SARS-CoV-2 airborne transmission in Syrian hamsters.
2025 · cited by 1
A study using Syrian hamsters (2025) found that airborne transmission and viral survival were moderately reduced under high temperature and high relative humidity conditions.
More against · 1
Infectivity duration of HCoV-OC43, a surrogate for SARS-CoV-2, in artificial bodily fluids on stainless steel simulating common nonporous surfaces.
2025 · cited by 1
A study on surrogate coronavirus OC43 survival on surfaces (2025) found prolonged infectivity at higher absolute humidity levels depending on organic matrix composition.
The paper trail · every fact has a biography
first checked01 Aug 2026
judged → CONTESTED · 4901 Aug 2026
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