I took a look at 2020 monthly temperature anomalies vs 2015-19 average at GISS Temp.
here are the results :
Jan +0,21 C
Feb +0,19 C
Mar +0,07 C
Apr +0,20 C
May +0,17 C
Jun +0,13 C
We had an "amazing", unprecedented and likely unreplicable experiment this year when globally many many factories closed off, airplanes were grounded, cars stoped, etc from roughly mid-march to mid-May, so aerosol emission fell by a lot.
If there were a big aerosol effect then April (and partly March and May) temperatures should have been much higher than Jan, Feb and June. They are not. And this somewhat proves to me that aerosol effects are not as strong as estimated.