Yn ystod y cyfnod clo, dewisodd llawer o bobl weithio gartref neu gerdded neu feicio i’r gwaith. Arweiniodd hynny at ostyngiad ar gyfartaledd o 36% yn lefelau NO2 y cyfnod.  Mewn arolwg diweddar, dywedodd dros hanner oedolion Cymru a holwyd y buon nhw’n mynd am dro’n amlach yn y cyfnod clo.
We know during lockdown, more and more people have chosen to either work from home, or walk or cycle to work – leading to, on average, a 36% reduction in NO2 during the lockdown period. In a recent survey, more than half of Welsh adults surveyed said they’d started taking more walks during lockdown.