Table 2. Combinations of contaminants evaluated, air pollution study, China, 2014.
| No. of contaminants | Combinations of air contaminants |
|
|---|---|---|
| Annual concentrations evaluated | Daily concentrations evaluated | |
| Five | N/A | PM2.5, PM10, NO2, SO2 and O3 |
| Four | N/A | (i) PM2.5, PM10, NO2 and O3; (ii) PM2.5, PM10, SO2 and O3; (iii) PM2.5, PM10, NO2 and SO2; (iv) PM2.5, O3, NO2 and SO2; and (v) PM10, O3, NO2 and SO2 |
| Three | PM2.5, PM10 and NO2 | (i) PM2.5, PM10 and O3; (ii) PM2.5, O3 and NO2; (iii) PM2.5, O3 and SO2; (iv) PM2.5, PM10 and NO2; (v) PM2.5, PM10 and SO2; (vi) PM10, SO2 and NO2; (vii) PM2.5, O3 and NO2; (viii) PM10, O3 and NO2; (ix) PM10, O3 and SO2; and (x) NO2, O3 and SO2 |
| Two | (i) PM2.5 and PM10; (ii) PM2.5 and NO2; and (iii) PM10 and NO2 | (i) PM2.5 and PM10; (ii) PM2.5 and O3; (iii) PM2.5 and NO2; (iv) PM2.5 and SO2; (v) PM10 and O3; (vi) PM10 and NO2; (vii) PM10 and SO2; (viii) O3 and NO2; (ix) O3 and SO2; and (x) NO2 and SO2 |
N/A: not applicable; NO2: nitrogen dioxide; O3: ozone; PM2.5: fine particulate matter less than or equal to 2.5 μm in diameter; PM10: coarse particulate matter with a diameter between 2.5 and 10 μm; SO2: sulfur dioxide.