Why secondary pollutants are more harmful than primary pollutants

The rules of engagement (roe) working group is often used to (select all that apply.)

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?