Ooh, fogggy !! Thank you. FWIW, I'll just show my age and mention those now-legendary 'pea-souper' fogs+smogs before 'smokeless'. Our school-yard's goal-keeper was forgotten when match-abandoned after ball lost, nearly collapsed with hypothermia. Buses stopped running because the drivers could not see stops or kerbs, recognise their routes' turnings. Schools shut at ~2 PM so us kids could walk home before dark. Passing drivers pleaded with us to walk along the kerb edge so they could follow us...