US air quality-past and future

An OGJ staff member just commented on having seen a new air emissions monitor at the on-ramp to the freeway as he drove to work in Houston. Houston's Harris County and seven surrounding counties are intensifying (mandated) efforts to reduce air pollution in this community of urban sprawl, two-car garages, and the largest concentration of refining-petrochemical facilities in the world. Carbon monoxide and sulfur dioxide emissions from the river of vehicles flowing slowly-both ways-along the city's many freeways and streets mingle in the sultry morning air. They blend with emissions of nitrogen oxides, particulate matter, and volatile organic compounds from the more than 120 refinin...

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