Table 3.
Correlation Matrix Among Air Pollutants and Apparent Temperature by Season in New York City, 2002–2006
| PM2.5 | O3 | NO2 | SO2 | CO | AT | |
| PM2.5 | 1.00 | −0.43 | 0.77 | 0.66 | 0.67 | 0.02 |
| O3 | 0.61 | 1.00 | −0.38 | −0.49 | −0.44 | 0.12 |
| NO2 | 0.54 | 0.34 | 1.00 | 0.68 | 0.68 | −0.05 |
| SO2 | 0.51 | 0.43 | 0.68 | 1.00 | 0.45 | −0.41 |
| CO | 0.40 | 0.03 | 0.61 | 0.35 | 1.00 | 0.09 |
| AT | 0.51 | 0.46 | 0.05 | −0.04 | 0.11 | 1.00 |
Abbreviations: AT, apparent temperature; CO, carbon monoxide; NO2, nitrogen dioxide; O3, ozone; PM2.5, particulate matter of aerodynamic diameter <2.5 μm; SO2, sulfur dioxide.
Upper diagonal shows correlation during cold season; lower diagonal shows correlation during warm season.