Pretty sure any impact from that would be a very long-term thing. A lifetime without particulates might have an effect; a month seems pretty far-fetched.
"In 2004, the American Heart Association issued a scientific statement concluding that exposure to air pollution contributes to cardiovascular illness and mortality. A 2010 update elaborated on those risks.
Short-term exposure can increase the risk of heart attack, stroke, arrhythmias and heart failure in susceptible people, such as the elderly or those with pre-existing medical conditions, according to the statement."
Seems like a pretty subtle and non-acute thing. Maybe even analogous to smoking: something that gradually erodes your health, not something that suddenly kills you.
I would tend to think there is both long term damage and chance of increased immediate death due to things like asthma and heart attack triggered by polluted air.
Short-term exposure can increase the risk of heart attack, stroke, arrhythmias and heart failure in susceptible people, such as the elderly or those with pre-existing medical conditions, according to the statement."
https://www.heart.org/en/health-topics/consumer-healthcare/w...