Greatest 3 digit number exactly divisible by 810 and 12

It doesn't exist because 810÷12=67.5 and 810×2=1620

The greatest 3 digit number divisible by 8, 10, & 12 would be 960.

Hope this helps☺️

Air pollution: “combustion results in gases such as nitrogen oxides, nitrogen dioxide and particulates. the main causes of air pollution include transport, domestic combustion and industrial processes. pollutants from these sources can cause problems in the immediate vicinity and a distance away.”