Calculate the value of AQI and assign its category:

$($a$)$ If the value for $1-$hr ozone is $0\mathrm{.}22$ ppm$,24-$hr SO$2$ is $0\mathrm{.}2$ ppm and $1-$hr NO$2$ is $0\mathrm{.}7$ ppm$.$

$($b$)$ If you measured the $1-$hr value of ozone to be $0\mathrm{.}156$ ppm and the $8-$hr value of O$3$ to be

$0\mathrm{.}138$ ppm$.$

Step $1$:

Identify the highest concentration among all of the

monitors within each reporting area and truncate as

follows:

Ozone $($ppm$)-$ truncate to $3$ decimal places

$P{M}_{2\mathrm{.}5}(\frac{g}{m^3})-$ truncate to $1$ decimal place

$P{M}_{10}(\frac{g}{m^3})-$ truncate to integer

$CO(ppm)-$ truncate to $1$ decimal place

SO$2($ppb$)-$ truncate to integer

$NO2(ppb)-$ truncate to integer

Step $2$:Using Table $2,$ find the two breakpoints that contain theconcentration.

Step $3$:Using Equation $1,$ calculate the index.

Step $4$:Round the index to the nearest integer