Purpose - Weather factors have a major impact on the tourism industry. Research on this issue is actively underway. However, while the interest of Particulate Matters is growing, research on Particulate Matters is lacking in the field of tourism. Research design, data, and methodology - Weather factors and Particulate Matters try to influence how they attract visitors to indoor-outdoor attractions. Especially, we try to distinguish tourist sites from indoor and outdoor. And I want to find out the difference between the influence of Particulate Matters and weather factors. Result - Particulate Matters are more influential on outdoor attractions than indoor tourist attractions. In order to attract visitors from tourist sites, weather factors have a greater impact than Particulate Matters. And the Particulate Matters and weather factors are highly related. Conclusions - This study confirms that Particulate Matters is affecting attracting visitors to tourist attractions. Further research is needed to see if behavior changes due to Particulate Matters recognition of actual tourists.