DTS is also completely backwards compatible, but in a way that allows legacy AV receivers and other products to play back DTS-HD Master Audio files at up to 1.5 Mbps with up to 7.1 discrete channels at 96 kHz or 5.1 channels at 192 kHz.
Smog usually is produced through a complex set of photochemical reactions involving volatile organic compounds (VOC's) and nitrogen oxides in the presence of sunlight that result in the production of ozone.
Chemical Reactions (Also known as a Chemical Change). A chemical reactions occurs when two or more substances meet, and they react in a way the either causes a change in the original substances, or the creations of one or two entirely new substances. A commonly known example is when vinegar and baking soda are mixed together. Vinegar is an acid, and baking soda is a base.