there's reports saying it was 2700 tons of ammonium nitrate

https://www.theguardian.com/world/live/2020/aug/04/beirut-explosion-huge-blast-port-lebanon-capital?CMP=share_btn_tw&page=with:block-5f29cf378f089d9b758a6c23#block-5f29cf378f089d9b758a6c23

for comparison, the Tianjin explosion was 800 tons and the Texas City disaster was 2200 tons

https://en.wikipedia.org/wiki/2015_Tianjin_explosions

https://en.wikipedia.org/wiki/Texas_City_disaster