Pollution View및 PollutionList 수정

1. 오염도 리스트의 오류 수정
2. 오염도 리스트의 경고 및 위험 단계 구분
3. 오염도 뷰를 그리기 위한 구조 추

Signed-off-by: karuana <mse201@gmail.com>