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Table 3 Correlation among air pollutants

From: Effect of hourly concentration of particulate matter on peak expiratory flow in hospitalized children: A panel study

 

Correlation coefficient

 

Morning

Noon

Evening

Night

 

(6 a.m. through 7 a.m.)

(12 p.m. through 1 p.m.)

(6 p.m. through 7 p.m.)

(12 a.m. through 1 a.m.)

PM2.5 - Ox

-0.44

-0.24

-0.27

-0.40

NO2 - PM2.5

0.54

0.78

0.62

0.56

Ox - NO2

-0.74

-0.53

-0.68

-0.72

  1. PM2.5: Particulate matter with a 50% cut-off of aerodynamic diameter ≤2.5 μm
  2. NO2: Nitrogen dioxide
  3. Ox: Photochemical oxidants
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Environmental Health

ISSN: 1476-069X