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.
Industrial smog occurs when the smoke and sulfur dioxide produced from burning coal merges with fog and creates a yellowish-brown-colored haze close to ground level. Photochemical smog forms as the result of increased usage of all fossil fuels, including gasoline and the burning of trees and organic waste.