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Study: Urban grime releases NOx when exposed to sunlight

Green Car Congress

When in the air, these compounds may combine with volatile organic compounds to produce ozone, the main component of smog. The grime exposed to a “solar simulator” shed more nitrates than the grime left in the dark, suggesting that light can chemically convert nitrogen compounds back into active forms that can return to the atmosphere.

Ozone 236
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California ARB LEV III Concept Targeting Fleet-Average SULEV-Level Emissions Performance from New Vehicles by MY 2022

Green Car Congress

Illustration of light-duty vehicle sales share by emission certification level projected to be required to meet. The existing LEV II program regulates emissions from new light-duty vehicles, including include all passenger cars, light trucks, and medium-duty passenger vehicles. proposed NMOG+NO x standards in new LEV III.

Emissions 186
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Report argues advanced HD natural gas vehicles foundational for California to hit air and climate goals; near zero-emission potential

Green Car Congress

Compared to the 2010 “Business as Usual” scenario—which includes all adopted emission control measures for the South Coast—NO x levels must be reduced by 65% and by 75% to meet the 2023 and 2032 ozone standards, respectively. An 80% reduction of GHG emissions is targeted for 2050, relative to 1990 levels.

Gas 257
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ARB posts discussion draft of new proposed mobile-source emissions reduction strategy through 2030; Advanced Clean Cars 2 regulation

Green Car Congress

ARB staff developed this strategy using a multi-pollutant scenario planning tool ( Vision 2.0 ) that quantifies changes in ozone and PM 2.5 Projected statewide light duty vehicle technology mix. Vision 2.0 Under current control programs (left) and under the Cleaner Technologies and Fuels scenario (right). Click to enlarge.

Clean 230
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California ARB soliciting research suggestions for FY 2012-2013 plan; sustainable communities, behavior, pollutant exposure, air pollution science, GHG targets

Green Car Congress

The deadline to submit research concepts is 31 January 2012. Development of sustainable communities strategies can also provide an opportunity for associated criteria pollutant emission reductions that will be needed to attain air quality standards for ozone and particulate matter as well as reduce near-roadway exposures.

Pollution 231
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Climate Expert: Don't Call It Geoengineering

Cars That Think

In light of this situation, there's increasing talk of actions that governments can take beyond reducing greenhouse gas emissions—actions that could either remove existing greenhouse gases from the atmosphere or reduce the amount of sunlight coming into the atmosphere. Hardly the breakthroughs we need to stave off disaster.

Climate 145
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The New Supersonic Boom

Cars That Think

Meanwhile, environmentalists were voicing concern—about how noisy such aircraft are taking off, about the possibility that their high-altitude emissions would erode the ozone layer, and about how disruptive the sonic booms would be. The key concept is a phenomenon known as Mach cutoff , the physics of which is straightforward.