Registered On: January 26, 2016
It’s good to see where alcazar gets his information from – some random Union Jack Bulldog obsessed guy “wiv half a braincell” ranting about Lorraine Kelly.
I agree you can’t judge changes of pollution levels by comparing photos from two days, there are too many factors (wind direction and speed, dampness, temperature, etc). If you go to a place like Beijing, you can see the huge differences the meteorological conditions have on the visibility one day, but you can judge it based on the percentage of smoggy days over a long enough period. The problem is that there is heavy smog (and other high pollution levels that are not visible) in many cities.
BUT we do have thousands of monitoring sites around the world (some very accurate reference monitors, and some that we can see trends but not accurate values). Looking at the raw data from these monitors shows the huge difference lockdown has had on our air quality (huge differences in some pollutants, and smaller differences in others). London is probably the city with the most reference monitors, and looking at the NOx (NO and NO2) results you can compare the months before April 2020 with the months since, and the after levels are around 25% of the before levels. The PM levels were less affected.
It is possible to ignore air quality issues, by concentrating on what is said on ITV daytime chat shows. But the fact of the matter is there are huge issues with air quality, both short-term (which most people seem to appreciate, as they don’t require any long-term forecasting) and long-term (where there is a more concerted effort to try and dismiss the science, and people thinking the tiny oil companies are being bullied by the huge environment research facilities)