Additionally, there were pollution and smoke from vehicle exhaust — particularly from diesel-fuelled buses, which had replaced the recently abandoned electric tram system — and from other industrial and commercial sources.
Кроме того, загрязнение шло от выхлопных газов автомобилей — особенно от недавно заменивших трамваи автобусов с дизельным двигателем — и других промышленных и коммерческих источников.