Copernicus provides the data in mg/m3, so your data is not correct.

Could you please correct the information of your service. I was researching the world's sulfur dioxide emissions today and I got worried. According to your website, there were really violent emissions in Europe due to the volcanic eruption in Iceland. I and also the British media went with the same misinformation. Sulfur dioxide is measured in mg/m3, not mg/m2, as is used on your website. This makes a huge difference. Please correct the information on your website as soon as possible. Here is a link to the media that made the news based on the information on your pages: https://www.dailymail.co.uk/news/article-13777191/Dont-outdoors-morning-Homeowners-given-health-alert-gas-cloud-tipped-skies-UK.html