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Air Quality

To begin, we’ll load foqat and show one dataset in foqat:
aqi is a dataset about time series of air quality with 1-second resolution.

library(foqat)
head(aqi)
#>                  Time        NO     NO2       CO SO2      O3
#> 1 2017-05-01 01:00:00 0.0376578 2.79326 0.256900  NA 56.5088
#> 2 2017-05-01 01:01:00 0.0341483 2.76094 0.254692  NA 57.0546
#> 3 2017-05-01 01:02:00 0.0310285 2.65239 0.265178  NA 57.6654
#> 4 2017-05-01 01:03:00 0.0357016 2.60257 0.269691  NA 58.7863
#> 5 2017-05-01 01:04:00 0.0337507 2.59527 0.273395  NA 59.0342
#> 6 2017-05-01 01:05:00 0.0238120 2.57260 0.276464  NA 59.2240

Calculate daily maximum-8-hour ozone

You can use dm8n() to calculate daily maximum-8-hour ozone.
colid is the column index of date. colio is the column index of ozone. outputMode have two options: value 1 will output 1 list which incudes 1 table (maximum-8-hour ozone); value 2 will output 1 list which contains 4 tables (8-hour ozone, statistics of the number of effective hourly concentrations in each 8-hour average concentration, statistics of the number of effective 8-hour average concentrations in each day, maximum-8-hour ozone). This function will calculate the average values of other species at the same time and plot them.

dm8n_df = dm8n(aqi, colio=6, outputmode = 1)

If you do not want the plot or you want to save time, you can try dm8n_np()

dm8n_df = dm8n_np(aqi, colio=6, outputmode = 1)
#> Joining with `by = join_by(temp_datetime)`
#> [1] "2017-05-01"
#> [1] "2017-05-02"
#> [1] "2017-05-03"
#> [1] "2017-05-04"
#> [1] "2017-05-05"
#> Joining with `by = join_by(date)`
dm8n_df
#>         date       O3       NO2        CO      SO2        NO
#> 1 2017-05-01       NA        NA        NA       NA        NA
#> 2 2017-05-02       NA        NA        NA       NA        NA
#> 3 2017-05-03 54.89782 0.4927718 0.2603227 0.427208 0.2720057
#> 4 2017-05-04 94.59790 1.3747043 0.3623108 3.785070 0.1757755
#> 5 2017-05-05 77.99124 2.3113478 0.2567683 1.712878 0.2380136

Calculate daily maximum-8-hour ozone in batch

dm8n_batch() allows you to calculate daily maximum-8-hour ozone of multiple sites (or cities, or sensors), which means that it will calculate daily maximum-8-hour ozone for all columns except first column (date).

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.