In Houston, air pollution concerns usually center on ozone. The area violates federal standards on ozone and perpetually struggles to become compliant.
But Houston environmentalists and businesses are paying increasingly close attention to another pollutant — fine dust. It’s more dangerous than ozone, some say, and the federal government will decide by the end of next year whether the Houston area violates newly tightened federal standards.
“It’s a big uncertainty right now,” said Dan Cohan, an associate professor of environmental engineering at Rice University.
If Houston is found to be in violation of federal standards, it could be costly ...