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Listening to music is quite soothing for many individuals. Regardless of our culture and background people the world over wish to hear songs and sing along or hum the melodies. Music often puts things into perspective mainly because it expresses emotion and strikes certain chords that we couldn't know existed. People react differently whenever they hear certain songs or beats of music. Airborne particulate matter can be a complex mixture of organic and inorganic substances which might be divided into two groups: coarse and fine particles. The fine particles include formed aerosols (gas that looked to particles), combustion particles, and metal vapors. The large particles are items like dust in the road or a factory. The fine particles are the ones most directly associated with acid rain and people are the ones we are likely to deal with today. They have one of the most relevance on the new laws in California regulating the emissions from semi-tractor trailers. While Santa Cruz is not a big city, you will find there's major artery, highway 1 which runs through our lovely ocean side communities in addition to mining in high altitude which generate particulates too.