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In August 2020 smoke drifted in from California fires which caused PM 2.5 levels to exceed 90 mg m −3 in Cache County, Utah, over 2.5 as high as the federal threshold level of 35 mg m −3. [30] Researchers were concerned the poor air quality would worsen symptoms from COVID-19 .
Vehicle emissions inspection station in Wisconsin. Arizona – biennially, in Phoenix and Tucson metro areas only, depending on age and type of vehicle. [27]California – biennially for all vehicles from out-of-state, regardless of age; and all vehicles made after 1975 which are more than six years old in all or some zip codes in 41 out of 58 counties.
Emissions from all non-road engines are regulated by categories. [49] In the United States, the emission standards for non-road diesel engines are published in the US Code of Federal Regulations, Title 40, Part 89 (40 CFR Part 89). Tier 1–3 Standards were adopted in 1994 and was phased in between 1996 and 2000 for engines over 37 kW (50 hp ...
A new emissions rule for cars, trucks and vans sold in the United States from 2027 to 2032 will phase reductions in more slowly to allow charging infrastructure and low-carbon emissions vehicles ...
The RV Industry Association argued in a Dec. 4 statement that because of a lack of certified zero-emission motorhome chassis, which is the vehicles' supporting frame, the rule could impact the ...
Some emission requirements are absent from the final rule. The newly adopted rule dropped one of the most contentious elements of the SEC’s initial March 2022 proposal, requiring companies to ...
It uses tiers to identify emission standards for cars, trucks and other motor vehicles. [8] In 2014, the EPA published its "Tier 3" standards for these vehicles, which tightened air pollution emission requirements and lowered the sulfur content in gasoline. [9] EPA has separate regulations for small engines, such as groundskeeping equipment.
2022: Emission tests in Rutherford County are eliminated, but vehicles that would have required emission tests will pay increased registration fee