Abstract
In order to assess the situation with air pollution by ozone in Colorado region during sunny part of the year (April to September), recently introduced photochemical pollution (PP) indicators have been applied on acquired ozone data, i.e. hourly ozone volume averages. PP indicators show very low values at the majority of stations except for the two located in Denver and Arvada which are located in the centre of the highly populated area covered by this assessment. Some other stations (e.g. National Renewable Energy Labs) have somewhat high number of excess times during the growth period ; total daily turnover of ozone is, however, rather low indicating absence of other photochemical pollutants (e.g. NOX) which, therefore, justify low values of PP indicators. Generally, our assessment method shows very low PP in the assessed area which is central, most populated part of the state of Colorado.
Highlights
Various photochemical oxidants in the lower troposphere, which are considered to be part of photochemical smog, are widely recognised as dangerous to both plants and animals.[1,2] That is especially true for the most polluted areas in the world such as, for example, Pearl River Delta in China.[3,4] As one of the most dangerous oxidants in atmosphere, ozone is one of the major tropospheric pollutants and an important component of the photochemical smog
Photochemical pollution indicators based on the ratio of maximum and minimum daily value of hourly ozone volume fractions have already shown its potential to become good measure for the photochemical pollution.[8,9]
Data in the table include location, name of the station followed by corresponding average values of the ozone volume fraction (A/ppb), average of daily maximum-to-minimum ratios (R), average of daily maxima (M /ppb), average excess time during which the 80 ppb limit was exceeded and averages of indicators P1, P2 and P3
Summary
Various photochemical oxidants in the lower troposphere, which are considered to be part of photochemical smog, are widely recognised as dangerous to both plants and animals (including humans).[1,2] That is especially true for the most polluted areas in the world such as, for example, Pearl River Delta in China.[3,4] As one of the most dangerous oxidants in atmosphere, ozone is one of the major tropospheric pollutants and an important component of the photochemical smog It should not, be omitted its important role as a protector of the life on Earth as part of the stratospheric ozone layer. According to the most recent analyses, oil and natural gas operations in Colorado represent high new source of volatile organic compounds which, in the end, causes elevated ozone values in the area.[13]
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