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WASHINGTON — A small change in the limit for ground-level ozone emissions could lead to wide-scale noncompliance of environmental rules and could lead to the federal government’s yanking funding commitments for infrastructure projects, business groups said.

Diesel’s national average price declined for the eighth consecutive week, dropping 3.2 cents to $2.782 per gallon, according to a report from the Department of Energy on July 20. The average price of gasoline fell by the identical amount.

After years of accounting for just a single-digit share of the heavy-truck brake market, air disc brakes are enjoying double-digit growth, and suppliers are optimistically predicting the systems will capture a quarter of the foundations brake market within a few years.

U.S. economic activity continued to expand from mid-May through June, with lower energy prices helping to boost consumer spending but remaining a drag on manufacturing, the Federal Reserve said July 15.

Federal regulators on July 13 formally published their proposal in the Federal Register that would tighten greenhouse-gas emissions for trucks, improve their fuel economy and regulate trailer efficiency for the first time.

Rep. Tom Rice (R-S.C.) introduced legislation that would raise federal fuel taxes by 10.1 cents per gallon, and index the new rate to inflation as a way to ensure the long-term solvency of the Highway Trust Fund.

WASHINGTON — The Environmental Protection Agency and the Obama administration as a whole will continue to emphasize their campaign against climate change from carbon emissions, even if all aspects of useful technologies are not known at present.