Emissions of Carbonyl Compounds from Vehicles Fuelled with Different Gasolines

Rate Constant Dependence on the Size of Aldehydes in the NO3 + Aldehydes Reaction. An Explanation via Quantum Chemical Calculations and CTST

“…More recently Arrhenius parameters for isobutanal and n -butanal have been published . Although the calculated results are expected to be slightly different than the experimental ones, the correspondence obtained in the present paper is excellent (Figure ): the activation energy for acetaldehyde differs only by 6% with respect to ref and % with respect to ref . In the cases of formaldehyde and n -butanal the differences are 5% 8 and 13%, respectively.…”

“…Aldehydes play an important role in both clean and polluted atmospheres because of their participation in the oxidation of volatile organic compounds (VOC) and in the OH radical and ozone formation. Large amounts of aldehydes are emitted into the troposphere from biogenic and anthropogenic sources. − Many abundant VOC produce aldehydes as important products. , Some examples are the reactions of the OH radical with alkenes and aromatic compounds and the addition of ozone to alkenes. In the troposphere a C n aldehyde reacts to form mainly the C n - 1 aldehyde. , It is widely accepted that the most important sink of aldehydes is the hydrogen abstraction reaction by an OH radical.…”

“…Large amounts of aldehydes are emitted into the troposphere from biogenic and anthropogenic sources. [1][2][3][4][5][6][7] Many abundant VOC produce aldehydes as important products. 8,9 Some examples are the reactions of the OH radical with alkenes and aromatic compounds and the addition of ozone to alkenes.…”

Quantitative kinetics reveal that reactions of HO2 are a significant sink for aldehydes in the atmosphere and may initiate the formation of highly oxygenated molecules via autoxidation

“…Aldehydes are released into the atmosphere by direct emission from biogenic and anthropogenic sources, [1][2][3][4][5][6] and they can be also formed by oxidation of volatile organic compounds (VOC) such as alkanes, alkenes, and alcohols. 7,8 Aldehydes play important roles in the atmosphere, including the formation of secondary organic aerosol (SOAs), [9][10][11] ozone, [12][13][14][15][16][17] and free radicals such as hydroxyl radical (OH) and hydroperoxyl radical (HO 2 ); and the reactions of aldehydes impact the atmospheric oxidation capacity.…”

Some Aspects of Indoor Air Quality in Romania

“…It is an unfortunate fact that toxic compounds and air pollutants like carbon monoxide, nitrogen oxides, volatile organic compounds, particulate matter, pesticides and radon, while undetectable to human senses, are also inhaled when breathing. This is why air quality is such a major concern and its control is a preoccupation for specialists worldwide [1][2][3][4][5]. Furthermore, interest in the effects of air pollution upon health has increased in recent years [6][7][8][9][10][11][12].…”