Comment on Abdul Jabbar et al. Air Quality, Pollution and Sustainability Trends in South Asia: A Population-Based Study. Int. J. Environ. Res. Public Health 2022, 19, 7534.

It is well established that both PM2.5 concentrations [4] and PM2.5 exposure [5] significantly increased in Pakistan during the last few decades. However, the PM2.5 exposure data reported by Abdul Jabbar et al. [1] do not show substantial variation between 1990 and 2017, and they state that the mean exposure to PM2.5 in Pakistan over the period was “steady”. We illustrate the discrepancy in Figure 1, which plots the time series of PM2.5 exposure data (2010–2017) obtained from the World Bank database (which are used by Abdul Jabbar et al. [ 1 ]) and PM2.5 concentrations obtained from both the Copernicus Atmosphere Monitoring Service (CAMS) reanalysis data (2010–2017) and the World Health Organization (WHO) website