Summary: This week on The Allegheny Front, stories about the air we breathe: tiny particles of pollution can be too small to see, but that doesn't mean that dirty air isn't affecting our health; some neighbors of an industrial coke plant say a recent fire there has made air pollution worse in their community; a new book looks at air pollution from a global perspective. Plus, the story of a Pittsburgh environmental group that started in the 1960s with a guerrilla marketing campaign and outrage over smoky skies.
