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CU Boulder study: routine household activities generate air quality on par with major polluted city

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Cooking, cleaning and other routine household activities generate significant levels of volatile and particulate chemicals inside the average home, leading to indoor air quality levels on par with a polluted major city, according to a study by researchers at the University of Colorado Boulder. Earlier post.).

Pollution 207
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Pollution plumes in Paris air are richer in gaseous aromatic compounds than in LA; gasoline engines main source of VOCs

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The study also shows that the proportion of gaseous aromatic compounds—apart from benzene—in hydrocarbon emissions is two to three times greater in pollution plumes in Paris than in Los Angeles, even though the total quantity of hydrocarbons emitted in Los Angeles remains considerably greater than in Paris. Borbon, A., Gilman, W.

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Satellite method provides insight into ozone-NOx-VOCs sensitivity for different locations

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Ozone pollution near Earth’s surface is one of the main ingredients of summertime smog. It is also not directly measurable from space due to the abundance of ozone higher in the atmosphere, which obscures measurements of surface ozone. —Jin et al.

Ozone 150
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HEI launches two new non-tailpipe particulate emission studies

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Emissions from automobile exhaust systems have decreased in recent years due to the introduction of cleaner fuels and new control technologies on internal combustion engines, as well as increases in numbers of hybrid and electric vehicles. 10 ) of urban air, a fraction known to be enriched with non-tailpipe constituents.

Emissions 353
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EPA waives requirements for gasoline pump vapor recovery

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However, as required by the Clean Air Act, automobile manufacturers began installing onboard refueling vapor recovery (ORVR) technologies in 1998, making gas stations’ systems increasingly redundant. Since 2006, all new automobiles and light trucks (pickups, vans and SUVs) are equipped with ORVR systems.

Gasoline 210
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EPA proposes waiving Federal requirements for stations to capture gasoline vapors when vehicles refuel beginning in 2013

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systems in areas classified “Serious,” “Severe,” or “Extreme” for nonattainment of the ozone national ambient air quality standard (NAAQS). Gasoline-rich vapors in an empty automobile fuel tank are forced out when liquid gasoline is pumped into the tank. The CAA requires states to implement Stage II gasoline vapor recovery.

EPA 186
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EPA, NHTSA issue One National Program Rule; EPA withdraws CA waiver for GHG and fuel economy

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criteria pollutants—is not affected by the action. The California waiver authority exists because California has uniquely difficult problems with ozone-forming pollutants. The action finalizes parts of the SAFE Vehicles Rule that was first proposed on 2 August 2018. Earlier post.)