Average concentrations to which people are exposed of particulate matter (PM10 and PM2.5) increased slightly between 2020 and 2021 though remained below pre-pandemic levels.
Cynyddodd y crynodiadau cyfartalog o ddeunydd gronynnol (PM10 a PM2.5) y mae pobl yn agored iddynt ychydig rhwng 2020 a 2021 ond gan aros islaw’r lefel cyn y pandemig.