Question

If you have both 1-hour and 8-hour data for ozone, report the higher AQI value. Suppose you had a 1-hour value of 0.163 ppm and an 8-hour value of 0.082 ppm. The reported AQI value should be Blank 1 a

Answer 1

To determine the higher AQI value between the 1-hour and 8-hour data for ozone, we need to convert the ozone concentrations in parts per million (ppm) to the corresponding Air Quality Index (AQI) values. The AQI is calculated based on specific breakpoints defined by the Environmental Protection Agency (EPA). Since the formula for calculating the AQI differs for 1-hour and 8-hour ozone data, we need to calculate the AQI for both time frames and compare the values.

For the 1-hour ozone data of 0.163 ppm, we can use the following formula to calculate the corresponding AQI:

AQI = (AQI_high - AQI_low) * (C - C_low) / (C_high - C_low) + AQI_low

Using the breakpoints provided by the EPA for 1-hour ozone:

AQI_low = 0

AQI_high = 500

C_low = 0.125 ppm

C_high = 0.164 ppm

C = 0.163 ppm

Plugging in these values into the formula, we can calculate the AQI for the 1-hour data:

AQI_1hour = (500 - 0) * (0.163 - 0.125) / (0.164 - 0.125) + 0

= 500 * 0.038 / 0.039 + 0

≈ 487

For the 8-hour ozone data of 0.082 ppm, we use a different set of breakpoints provided by the EPA for 8-hour ozone:

AQI_low = 0

AQI_high = 500

C_low = 0.065 ppm

C_high = 0.084 ppm

C = 0.082 ppm

Calculating the AQI for the 8-hour data:

AQI_8hour = (500 - 0) * (0.082 - 0.065) / (0.084 - 0.065) + 0

= 500 * 0.017 / 0.019 + 0

≈ 447

Comparing the two AQI values, we find that the higher AQI value is 487, which corresponds to the 1-hour data of 0.163 ppm.

Answer 2

Okay, let's go through this step-by-step:

- We have a 1-hour ozone value of 0.163 ppm

- We have an 8-hour ozone value of 0.082 ppm

- To determine the AQI value, we first need to convert the ozone values to AQI using the appropriate breakpoints table.

- For 1-hour ozone, 0.163 ppm corresponds to an AQI of 101 according to the EPA breakpoints table.

- For 8-hour ozone, 0.082 ppm corresponds to an AQI of 54.

- Since the 1-hour AQI of 101 is higher than the 8-hour AQI of 54, we would report the 1-hour AQI value of 101 as the overall AQI.

Therefore, the reported AQI value in this case is 101.