Union of Concerned Scientists

JUNE 17, 2025

EPA affirmed the basis for California’s regulation, noting “the large share of older locomotives in the Class I, II, and III railroad fleets and their emissions[‘] contribution to ambient concentrations of air pollution that may violate the ozone and particulate matter [air quality standards].”

Regulations

Legal Planet

MARCH 17, 2025

Understanding the Endangerment Finding Two requirements must be met before a substance can be regulated under the Clean Air Act. First, it has to qualify as an air pollutant. The Clean Air Act defines an air pollutant to be any air pollution agent or combination of such agents, including any precursor chemicals.

Clean Air Act

Legal Planet

DECEMBER 18, 2024

EPA also granted another waiver for something called the Omnibus Low NOx rule, submitted more than two years ago, which would require trucks to cut NOx pollution by 90 percent below current levels. In granting the waiver, EPA made clear that the California program will cut the air pollutants that cause smog dramatically.

Clean Air Act

Circle of Blue

JULY 9, 2025

The Paris Climate Agreement seemed well-positioned to join the 1963 Nuclear Test Ban Treaty (halting atomic explosions above ground that contaminated the atmosphere) and the 1987 Montreal Protocol (ending use of chemicals that damaged the ozone layer) as one of the three most significant environmental treaties ever negotiated.

Clean Energy

Legal Planet

JUNE 24, 2025

Advocates campaigned for cleaner vehicles to cut pollution, and California led a lawsuit by 16 states seeking to electrify the mail trucks. C alifornia’s intervention “played a big part in stopping USPS from committing to decades of air pollution around the nation,” Liane Randolph, head of the state’s Air Resources Board, said.

Clean Energy

Union of Concerned Scientists

FEBRUARY 10, 2025

UCS/S&P Global Mobility 2024 This accelerated transition to cleaner on-road freight is vital to reduce harmful air pollution generated from trucks, given that theyre the largest source of ozone-forming nitrogen oxides (NOx) pollution in the nation and the largest source of lung-damaging fine particulates from vehicles on the road.

Nitrogen Oxides

PA Environment Daily

JULY 30, 2025

million Pennsylvanians living within a half-mile of active well sites. -- Allegheny, Bucks, and Philadelphia counties all received a D or F grade for ozone pollution in the American Lung Association’s 2025 State of the Air report. -- Nationally, air pollution from methane and co-pollutants causes an estimated $77 billion in annual health costs.

Clean Air Act

Union of Concerned Scientists

MAY 15, 2025

The increase in loading docks is of particular importance when looking at the air and climate pollution impacts from warehouses. Additionally, heavy-duty trucks are responsible for over half of fine particulate pollution emitted from on-road vehicles as well as a growing share of climate-warming emissions.

Ground-Level Ozone

PA Environment Daily

JULY 10, 2025

VOCs, such as benzene, are harmful to health and can contribute to ground level ozone or smog that damages lungs and can trigger asthma attacks. I have had days where my own asthma has been aggravated for no other attributable reason than pollution escaping from these facilities.

Natural Gas

PA Environment Daily

APRIL 27, 2025

Martins Latest Guitar For Earth Day, Lehigh Valley Company Continues Environmental Tradition -- Citizen Scientists Help Toads Cross The Road In Roxborough Neighborhood Of Philadelphia; 22,000 Toads Saved Over 16 Years [PaEN] -- PA Firefly Festival Receives Over 1,800 Entries To Campout Lottery; Private Guided Firefly Eco-Tours Available At Kellettville (..)

Earth Day

PA Environment Daily

MAY 9, 2025

Million In Energy Costs In 2024 [PaEN] -- Environmental Integrity Project, Partners List Industries Requesting Exemptions From EPA Hazardous Air Pollutant Regulations-- 23 In PA [PaEN] NewsClips: -- Capital & Main - Audrey Carleton: Solar Grants Being Held Hostage In PA Legislature As Demand Soars -- Sen. And Saved $44.2

Air Pollution

Union of Concerned Scientists

AUGUST 7, 2025

By adding fine particulates to the air, wildfires can drive unhealthy air quality conditions, as measured by the AQI, shown above. When combined with summer heat and ground level ozone, conditions can worsen further.

Ground-Level Ozone

Scientific American

JULY 16, 2025

Air pollutants like ozone and nitrogen dioxide can cause inflammation in the nerves that play a role in migraines. Temperature extremes, with very hot or very cold days , or sudden changes in temperature , can throw off the body’s internal balance. High humidity or rapid shifts in moisture levels can have a similar effect.

Ozone

New Scientist

JUNE 20, 2024

An aerial survey of Los Angeles reveals that high temperatures cause plants to emit more compounds that can contribute to harmful ozone and PM2.5 air pollution

Air Pollution

New Scientist

APRIL 11, 2024

Ground-level ozone, a product of pollution from cars, degrades insect pheromones, and this can result in mismatched mating and sterile offspring

Ground-Level Ozone

Union of Concerned Scientists

AUGUST 2, 2022

A key step towards addressing climate change and air quality. Cleaning up heavy-duty vehicles is one of the most consequential tasks in reducing climate-warming greenhouse gases and toxic air pollution from the transportation sector. These policies will complement the important provisions in the Inflation Reduction Act of 2022.

Nitrogen Oxides

Breezometer

AUGUST 16, 2021

Levels of Ground-level Ozone Pollution Can Increase in Summer. As ground-level ozone requires the presence of sunlight to form, high heat and sunny weather can function to increase concentrations of this particular pollutant. billion, thanks in part to a reduced impact on children. for maize, 4.1% for soybean, and 7.3%

Air Pollution

PA Environment Daily

APRIL 26, 2024

The Department of Environmental Protection published notice in the April 27 PA Bulletin inviting public comments on a proposed declaration of an Exceptional Air Quality Event due to 2023 wildfires from Canada and New Jersey causing elevated levels of nitrogen oxides and volatile organic compounds impacting ozone pollution in Pennsylvania.

Air Pollution

Union of Concerned Scientists

SEPTEMBER 30, 2024

For example, inclusion of a non-chemical stressor—higher daily temperatures—was considered in the scientific document used to support the ozone standard , since there is evidence that exposure to higher daily temperatures together with ozone exposure is associated with higher mortality.

Air Pollution

Breezometer

DECEMBER 7, 2021

Our ozone layer serves as a lifesaving UV barrier for planet earth, functioning to absorb most of the sun’s ultraviolet radiation. At the same time, ground-level ozone pollution is extremely harmful to human health. Good Ozone’: Our Essential Sun Shield. How is Ozone Created?

Ozone

Environmental News Bits

APRIL 8, 2022

Exposure to ozone from air pollution may be connected to a rise in depression among adolescents, a new study has found. The study, published in the journal Developmental Psychology on Monday, is the first to link ozone levels to the development of depression in adolescents over time. Read the full story at The Hill.

Ozone

Scientific American

JANUARY 6, 2022

population to a stew of particulate matter and ozone. -- Read more on ScientificAmerican.com. The 2020 fire season subjected half the western U.S.

Air Pollution

Legal Planet

AUGUST 23, 2021

Urban air pollution kills millions of people around the world. We will also get rid of coal mines and oil wells, which produce other kinds of pollution today. If we work really hard, however, we can keep the impacts manageable. Accomplishing that will be no easy feat. What does it buy us?

Climate Change

New Scientist

JANUARY 18, 2022

Levels of nitrogen oxides and ozone on a par with average concentrations next to major UK roads led to a reduction in the number of pollinators counted on the crops by up to 70 per cent

Nitrogen Oxides

Environmental News Bits

FEBRUARY 9, 2022

A new study finds pollination reduced by almost a third when diesel fumes and ozone were present – the negative impact of these common air pollutants on pollination were observed in the natural environment. Read the full story from the University of Reading. Read more →

Air Pollution

New Scientist

JANUARY 5, 2022

The simultaneous occurence of extreme levels of ozone and particulate matter have increased significantly in the past decade due to wildfires in the western US

Air Pollution

Union of Concerned Scientists

APRIL 2, 2024

Air pollution from ports comes from many sources: ships, trains, tugboats, cargo equipment, and – quite importantly – the trucks that move cargo containers to and from ports. Because drayage trucks tend to be among the oldest tractor trucks on the road, they tend to pollute at greater rates than other tractors.

Air Pollution

Union of Concerned Scientists

JULY 9, 2024

To explore a small piece of what is at stake, let’s take a quick look at some of the rules currently under review at the EPA: Air emission reporting requirements If finalized and implemented, this rule will improve the way air pollution emissions are estimated and collected by the EPA.

Toxic Substances Control Act

Real Climate

SEPTEMBER 19, 2021

Methane emissions have a feedback on its own lifetime, serve as an ozone precursor, and reduce the production of sulphate and nitrate aerosols (and consequently indirect cloud-aerosol effects), all of which amplify its net warming effect to about 1.2 W/m² (to about 60% of the CO 2 effect since 1750).

Carbon Dioxide

Legal Planet

JUNE 27, 2024

Months ago, the Supreme Court agreed to hear an “emergency” request to stay EPA’s new rule regulating interstate air pollution. A Supreme Court case called EME Homer upheld EPA’s general approach to regulating interstate air pollution. Circuit even had a chance to consider the merits of the challenges.

Air Pollution

PA Environment Daily

AUGUST 6, 2022

The following factsheet on asthma and air pollution from natural gas facilities was compiled by the Environmental Health Project -- Asthma is a chronic disease that affects breathing. Asthma attacks, also known as exacerbations, may be triggered by indoor and outdoor air pollution, stress, and other physical and environmental factors.

Air Pollution

Union of Concerned Scientists

MAY 4, 2023

Trucks and buses on California’s roads and highways are responsible for the majority of lung-damaging fine particulate and ozone-forming nitrogen oxide emissions, and a sizable amount of climate-warming greenhouse gas emissions as well.

Nitrogen Oxides

Union of Concerned Scientists

SEPTEMBER 17, 2024

Medium- and heavy-duty vehicles (MHDVs), like the big rigs on our highways and the vans that deliver our packages, make up just over 1 in 10 of the vehicles on our roads, but are responsible for over half of ozone-forming nitrogen oxide pollution and lung-damaging fine particulate pollution from on-road vehicles.

Electricity

Breezometer

OCTOBER 25, 2021

In both the US AQI and the Nowcast, the higher the value, the greater the level of air pollution, and the greater the health concern. What Pollutants Does it Cover? Ground-level ozone (03) Particle pollution (PM2.5 Ground-level ozone (03) Particle pollution (PM 2.5) Particle pollution (PM 10).

Ground-Level Ozone

Union of Concerned Scientists

DECEMBER 1, 2022

Diesel pollution is a known carcinogen , and particulate emissions like those from trucks have clear negative health impacts including heart disease and increased emergency room visits for cardiovascular problems. We in Colorado have many days of problematic ozone. We need every tool we can apply to gain healthier air.

Nitrogen Oxides

Legal Planet

OCTOBER 26, 2022

discussing the ways in which local air districts can take action to end harmful air pollution from building appliances. In California, CARB and the state’s 35 local air districts share authority to adopt and enforce control strategies to achieve these standards.

Clean Air Act

Real Climate

SEPTEMBER 26, 2022

A second set of climate model simulations can be run with all of the factors we think of as important – the natural drivers of course, but also the anthropogenic changes (greenhouse gas changes, air pollution, ozone depletion, irrigation, land use change etc.).

Climate Change