Fluorescence lidar technology enables a better determination of the origin of particles in the atmosphere. The method can ...

Why People Smoke. Carl C. Seltzer has been engaged in research in physical anthropology at Harvard since 1937, and a survey which he made of the smoking habits of the class of 194 ...

The smoke in the air on Tuesday was so thick you could see it and smell it. The Minnesota Pollution Control Agency (MPCA) ...