The paper says that short-term peaks are linked to health issues (from page 2): > epidemiologists are increasingly recognising that exposure to high intensitie

The paper says that short-term peaks are linked to health issues (from page 2): > epidemiologists are increasingly recognising that exposure to high intensities of PM over much shorter periods of time—hours rather than days—is linked to a range of health issues .Indeed, Lin et al. found a significant association between hourly peakPM2.5andmortality rates across six Chinese cities. Similarly, a systematic review of 196 articles found a positive relationship between short term PM exposure and cardiovascular, respiratory, and cerebrovascular mortality https://www.mdpi.com/2073-4433/11/12/1326# https://www.mdpi.com/2073-4433/11/12/1326#