True or false no explanation needed

16. In modeling it is important to use a small receptor grid near a facility. 17. The most important parameter used to evaluate the performance of the plume buoyancy is the outlet gas temperature. 18. Large buildings tend not to cause impacts with your air dispersion model 19. If you are able to download data from government of Saskatchewan website, this is considered corrected data 20. Stack sampling is not that important and can be done once every 5 years