Union of Concerned Scientists
SEPTEMBER 26, 2024
One good example of the nexus between global warming and local pollution is ground-level ozone. To make matters worse, NOx contributes to the formation of ground-level ozone and secondary PM2.5, Therefore, controlling for NOx and SOx helps reduce PM2.5 which is formed in the atmosphere from precursor gases such as NOx.
Legal Planet
AUGUST 22, 2023
States and local air quality regulators have the legal authority to set particulate matter (PM), ozone, and nitrogen oxides (NOx) emissions standards and adopt regulations for these pollutants when they are already in attainment of the national ambient air quality standards ( NAAQS ) set by the U.S.
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Union of Concerned Scientists
APRIL 20, 2023
Specifically, while the Court did not ultimately rule out all possible interventions beyond direct pollution controls at individual sources, it did make clear that direct pollution controls were the clearest course, meaning that moving forward, EPA is likely to devise BSER based on things that can be applied “at or to” a polluting facility.
Vorys Law
JANUARY 26, 2021
On January 20, 2021, the Ohio EPA’s Division of Air Pollution Control (DAPC) hosted a “Program Advisory Group” (PAG) meeting via Microsoft Teams to inform interested stakeholders of recent and upcoming DAPC activities. This post focuses on Ohio EPA’s anticipated regulatory changes to address non-attainment of the 2015 Ozone NAAQS.
Acoel
JUNE 29, 2022
It marks the seventh round of NOx controls for the EGU sector since 1990. The agency’s air quality modeling indicates that most areas would receive an ozone reduction of less than 0.1 enjoyed ozone reductions of 3 to 5 ppb or more. Ozone concentrations in over 70 percent (i.e., ppb by 2025. EPA estimated that: .
Union of Concerned Scientists
MARCH 1, 2023
You can compare this to ozone which has a half-life on the order of minutes, and some PFAS chemicals that have a half-life in air on the order of several years. It is released into the environment as a gas and can break down in air and water. About half of the amount released is broken down in the air within 2 to 5 months.
Legal Planet
OCTOBER 26, 2022
As we explained in our brief, under the federal Clean Air Act, states are required to submit SIPs detailing strategies to come into attainment with federal air quality standards for pollutants like ozone and PM2.5.
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