请问如何从AQI的计算公式中得出所谓的美国大使馆搞双重 ...

如题，有人说美帝本土搞的是24小时平均值，而美帝使馆搞的是实时值，这不科学，是双重标准。而依据就是那个AQI计算公式，那么就贴出来看看这个公式是什么


How are your particle pollution maps calculated?

The AQI for particle pollution was developed for assessing air quality conditions over a 24-hour period. To assess air quality conditions at a given time using the AQI, one would ideally use the average particle pollution measurement over a 24-hour window centered about the hour being measured (i.e., midpoint of the 24-hour range or Mid-24) to compute the AQI. The issue, however, in protecting public health via the AQI for particles is that twelve hours of future data are not available. Therefore, a surrogate or estimation method was developed which uses a combination of hourly particle concentrations from previous hours to estimate the Mid-24 average.

This surrogate method combines both the 4-hour average and the 12-hour average in the following manner:

    Calculate the average of the previous 12 hours.
    Calculate the ratio of the most recent hour to the average of the previous 12 hours.
    Calculate an "Adjusted" hourly value:
        The adjusted hourly value is equal to the actual hourly value, if the actual hourly value is < 30 μg/m3.
        The adjusted hourly value is equal to the actual hourly value, if the actual hourly value is > 30 μg/m3 and the ratio of most recent hourly value to the average of most recent 12 hourly values is < 0.9 or > 1.7.
        Otherwise, the adjusted hourly value is equal to 0.75 times the actual hourly value.
    Calculate the "Adjusted" 4-hour average, which is the average of the 4 most recent "Adjusted" hourly values.
    Estimate the Mid-24 as:
        [12×(12-hour average) + 12×(4-hour adjusted average)]÷24.

In summary, the surrogate method is the average of the 12-hour average and an adjusted 4-hour average for particles.

These estimated concentrations are used until 18 out of 24 values or more are available for calculating a "real" mid-point 24-hour average for each hour of the day.

公式里分明写着最新4小时的修正值这个变量，也就是说这个公式计算的是实时值，而不是什么所谓的24小时平均值。而美国网站上公布的AQI也是实时值，那么既然大使馆和美帝自家用的都是实时值，请问所谓的双重标准又从何而来？除非你能证明美帝大使馆不是用这个公式来计算AQI的，那么我就承认这确实是双重标准如题，有人说美帝本土搞的是24小时平均值，而美帝使馆搞的是实时值，这不科学，是双重标准。而依据就是那个AQI计算公式，那么就贴出来看看这个公式是什么


How are your particle pollution maps calculated?

The AQI for particle pollution was developed for assessing air quality conditions over a 24-hour period. To assess air quality conditions at a given time using the AQI, one would ideally use the average particle pollution measurement over a 24-hour window centered about the hour being measured (i.e., midpoint of the 24-hour range or Mid-24) to compute the AQI. The issue, however, in protecting public health via the AQI for particles is that twelve hours of future data are not available. Therefore, a surrogate or estimation method was developed which uses a combination of hourly particle concentrations from previous hours to estimate the Mid-24 average.

This surrogate method combines both the 4-hour average and the 12-hour average in the following manner:

    Calculate the average of the previous 12 hours.
    Calculate the ratio of the most recent hour to the average of the previous 12 hours.
    Calculate an "Adjusted" hourly value:
        The adjusted hourly value is equal to the actual hourly value, if the actual hourly value is < 30 μg/m3.
        The adjusted hourly value is equal to the actual hourly value, if the actual hourly value is > 30 μg/m3 and the ratio of most recent hourly value to the average of most recent 12 hourly values is < 0.9 or > 1.7.
        Otherwise, the adjusted hourly value is equal to 0.75 times the actual hourly value.
    Calculate the "Adjusted" 4-hour average, which is the average of the 4 most recent "Adjusted" hourly values.
    Estimate the Mid-24 as:
        [12×(12-hour average) + 12×(4-hour adjusted average)]÷24.

In summary, the surrogate method is the average of the 12-hour average and an adjusted 4-hour average for particles.

These estimated concentrations are used until 18 out of 24 values or more are available for calculating a "real" mid-point 24-hour average for each hour of the day.

公式里分明写着最新4小时的修正值这个变量，也就是说这个公式计算的是实时值，而不是什么所谓的24小时平均值。而美国网站上公布的AQI也是实时值，那么既然大使馆和美帝自家用的都是实时值，请问所谓的双重标准又从何而来？除非你能证明美帝大使馆不是用这个公式来计算AQI的，那么我就承认这确实是双重标准