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char = f;code = 102
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result sql = Traffic-related air pollution and the development of asthma and allergies during the first 8 years of life.
Traffic-related air pollution and the development of asthma and allergies during the first 8 years of life.
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char = t;code = 116
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char = C;code = 67
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char = V;code = 86
char = E;code = 69
char = S;code = 83
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char = s;code = 115
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char = e;code = 101
char = e;code = 101
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char = f;code = 102
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char = l;code = 108
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char = <;code = 60
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char = S;code = 83
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char = s;code = 115
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = r;code = 114
char = o;code = 111
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = ;code = 32
char = (;code = 40
char = N;code = 78
char = O;code = 79
char = (;code = 40
char = 2;code = 50
char = );code = 41
char = );code = 41
char = ,;code = 44
char = ;code = 32
char = p;code = 112
char = a;code = 97
char = r;code = 114
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = u;code = 117
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = m;code = 109
char = a;code = 97
char = t;code = 116
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = (;code = 40
char = P;code = 80
char = M;code = 77
char = (;code = 40
char = 2;code = 50
char = .;code = 46
char = 5;code = 53
char = );code = 41
char = );code = 41
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = o;code = 111
char = t;code = 116
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = b;code = 98
char = i;code = 105
char = r;code = 114
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = a;code = 97
char = d;code = 100
char = d;code = 100
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = m;code = 109
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = -;code = 45
char = u;code = 117
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = g;code = 103
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = s;code = 115
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = d;code = 100
char = e;code = 101
char = l;code = 108
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = A;code = 65
char = s;code = 115
char = s;code = 115
char = o;code = 111
char = c;code = 99
char = i;code = 105
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = t;code = 116
char = w;code = 119
char = e;code = 101
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = p;code = 112
char = o;code = 111
char = s;code = 115
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = f;code = 102
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = -;code = 45
char = r;code = 114
char = e;code = 101
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = i;code = 105
char = r;code = 114
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = l;code = 108
char = l;code = 108
char = u;code = 117
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = p;code = 112
char = e;code = 101
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = h;code = 104
char = e;code = 101
char = a;code = 97
char = l;code = 108
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = o;code = 111
char = u;code = 117
char = t;code = 116
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = s;code = 115
char = e;code = 101
char = s;code = 115
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = p;code = 112
char = e;code = 101
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = -;code = 45
char = m;code = 109
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = l;code = 108
char = o;code = 111
char = g;code = 103
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = g;code = 103
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = s;code = 115
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = a;code = 97
char = l;code = 108
char = y;code = 121
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = E;code = 69
char = f;code = 102
char = f;code = 102
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = q;code = 113
char = u;code = 117
char = a;code = 97
char = r;code = 114
char = t;code = 116
char = i;code = 105
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = n;code = 110
char = g;code = 103
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = p;code = 112
char = o;code = 111
char = s;code = 115
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = f;code = 102
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = d;code = 100
char = j;code = 106
char = u;code = 117
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = v;code = 118
char = a;code = 97
char = r;code = 114
char = i;code = 105
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = .;code = 46
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
char = <;code = 60
char = b;code = 98
char = >;code = 62
char = M;code = 77
char = E;code = 69
char = A;code = 65
char = S;code = 83
char = U;code = 85
char = R;code = 82
char = E;code = 69
char = M;code = 77
char = E;code = 69
char = N;code = 78
char = T;code = 84
char = S;code = 83
char = ;code = 32
char = A;code = 65
char = N;code = 78
char = D;code = 68
char = ;code = 32
char = M;code = 77
char = A;code = 65
char = I;code = 73
char = N;code = 78
char = ;code = 32
char = R;code = 82
char = E;code = 69
char = S;code = 83
char = U;code = 85
char = L;code = 76
char = T;code = 84
char = S;code = 83
char = ;code = 32
char = :;code = 58
char = ;code = 32
char = <;code = 60
char = /;code = 47
char = b;code = 98
char = >;code = 62
char = A;code = 65
char = n;code = 110
char = n;code = 110
char = u;code = 117
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = v;code = 118
char = a;code = 97
char = l;code = 108
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = 3;code = 51
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = 6;code = 54
char = %;code = 37
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = t;code = 116
char = h;code = 104
char = m;code = 109
char = a;code = 97
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = 1;code = 49
char = 2;code = 50
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = 2;code = 50
char = 3;code = 51
char = %;code = 37
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = t;code = 116
char = h;code = 104
char = m;code = 109
char = a;code = 97
char = ;code = 32
char = s;code = 115
char = y;code = 121
char = m;code = 109
char = p;code = 112
char = t;code = 116
char = o;code = 111
char = m;code = 109
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = A;code = 65
char = n;code = 110
char = n;code = 110
char = u;code = 117
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = t;code = 116
char = h;code = 104
char = m;code = 109
char = a;code = 97
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = 6;code = 54
char = %;code = 37
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = a;code = 97
char = g;code = 103
char = e;code = 101
char = ;code = 32
char = 1;code = 49
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = 1;code = 49
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = 2;code = 50
char = %;code = 37
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = g;code = 103
char = e;code = 101
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = P;code = 80
char = M;code = 77
char = (;code = 40
char = 2;code = 50
char = .;code = 46
char = 5;code = 53
char = );code = 41
char = ;code = 32
char = l;code = 108
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = s;code = 115
char = o;code = 111
char = c;code = 99
char = i;code = 105
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = n;code = 110
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = t;code = 116
char = h;code = 104
char = m;code = 109
char = a;code = 97
char = ;code = 32
char = (;code = 40
char = o;code = 111
char = d;code = 100
char = d;code = 100
char = s;code = 115
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = ;code = 32
char = [;code = 91
char = O;code = 79
char = R;code = 82
char = ];code = 93
char = ,;code = 44
char = ;code = 32
char = 1;code = 49
char = .;code = 46
char = 2;code = 50
char = 8;code = 56
char = ;;code = 59
char = ;code = 32
char = 9;code = 57
char = 5;code = 53
char = %;code = 37
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = f;code = 102
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = v;code = 118
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = [;code = 91
char = C;code = 67
char = I;code = 73
char = ];code = 93
char = ,;code = 44
char = ;code = 32
char = 1;code = 49
char = .;code = 46
char = 1;code = 49
char = 0;code = 48
char = -;code = 45
char = 1;code = 49
char = .;code = 46
char = 4;code = 52
char = 9;code = 57
char = );code = 41
char = ,;code = 44
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = v;code = 118
char = a;code = 97
char = l;code = 108
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = t;code = 116
char = h;code = 104
char = m;code = 109
char = a;code = 97
char = ;code = 32
char = (;code = 40
char = O;code = 79
char = R;code = 82
char = ,;code = 44
char = ;code = 32
char = 1;code = 49
char = .;code = 46
char = 2;code = 50
char = 6;code = 54
char = ;;code = 59
char = ;code = 32
char = 9;code = 57
char = 5;code = 53
char = %;code = 37
char = ;code = 32
char = C;code = 67
char = I;code = 73
char = ,;code = 44
char = ;code = 32
char = 1;code = 49
char = .;code = 46
char = 0;code = 48
char = 4;code = 52
char = -;code = 45
char = 1;code = 49
char = .;code = 46
char = 5;code = 53
char = 1;code = 49
char = );code = 41
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = v;code = 118
char = a;code = 97
char = l;code = 108
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = t;code = 116
char = h;code = 104
char = m;code = 109
char = a;code = 97
char = ;code = 32
char = s;code = 115
char = y;code = 121
char = m;code = 109
char = p;code = 112
char = t;code = 116
char = o;code = 111
char = m;code = 109
char = s;code = 115
char = ;code = 32
char = (;code = 40
char = O;code = 79
char = R;code = 82
char = ,;code = 44
char = ;code = 32
char = 1;code = 49
char = .;code = 46
char = 1;code = 49
char = 5;code = 53
char = ;;code = 59
char = ;code = 32
char = 9;code = 57
char = 5;code = 53
char = %;code = 37
char = ;code = 32
char = C;code = 67
char = I;code = 73
char = ,;code = 44
char = ;code = 32
char = 1;code = 49
char = .;code = 46
char = 0;code = 48
char = 2;code = 50
char = -;code = 45
char = 1;code = 49
char = .;code = 46
char = 2;code = 50
char = 8;code = 56
char = );code = 41
char = .;code = 46
char = ;code = 32
char = F;code = 70
char = i;code = 105
char = n;code = 110
char = d;code = 100
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = m;code = 109
char = i;code = 105
char = l;code = 108
char = a;code = 97
char = r;code = 114
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = N;code = 78
char = O;code = 79
char = (;code = 40
char = 2;code = 50
char = );code = 41
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = o;code = 111
char = t;code = 116
char = .;code = 46
char = ;code = 32
char = A;code = 65
char = s;code = 115
char = s;code = 115
char = o;code = 111
char = c;code = 99
char = i;code = 105
char = a;code = 97
char = t;code = 116
char = i;code = 105
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result sql = RATIONALE : The role of air pollution exposure in the development of asthma, allergies, and related symptoms remains unclear, due in part to the limited number of prospective cohort studies with sufficiently long follow-ups addressing this problem.

OBJECTIVES : We studied the association between traffic-related air pollution and the development of asthma, allergy, and related symptoms in a prospective birth cohort study with a unique 8-year follow-up.

METHODS : Annual questionnaire reports of asthma, hay fever, and related symptoms during the first 8 years of life were analyzed for 3,863 children. At age 8, measurements of allergic sensitization and bronchial hyperresponsiveness were performed for subpopulations (n = 1,700 and 936, respectively). Individual exposures to nitrogen dioxide (NO(2)), particulate matter (PM(2.5)), and soot at the birth address were estimated by land-use regression models. Associations between exposure to traffic-related air pollution and repeated measures of health outcomes were assessed by repeated-measures logistic regression analysis. Effects are presented for an interquartile range increase in exposure after adjusting for covariates.

MEASUREMENTS AND MAIN RESULTS : Annual prevalence was 3 to 6% for asthma and 12 to 23% for asthma symptoms. Annual incidence of asthma was 6% at age 1, and 1 to 2% at later ages. PM(2.5) levels were associated with a significant increase in incidence of asthma (odds ratio [OR], 1.28; 95% confidence interval [CI], 1.10-1.49), prevalence of asthma (OR, 1.26; 95% CI, 1.04-1.51), and prevalence of asthma symptoms (OR, 1.15; 95% CI, 1.02-1.28). Findings were similar for NO(2) and soot. Associations were stronger for children who had not moved since birth. Positive associations with hay fever were found in nonmovers only. No associations were found with atopic eczema, allergic sensitization, and bronchial hyperresponsiveness.

CONCLUSIONS : Exposure to traffic-related air pollution may cause asthma in children.

Publication: Am. J. Respir. Crit. Care Med. 2010 Mar 15 ;181(6)::596-603. :doi: 10.1164/rccm.200906-0858OC.
Publication Date: 2010 Mar 15
Study Author(s): Gehring, Ulrike;Wijga, Alet H;Brauer, Michael;Fischer, Paul;de Jongste, Johan C;Kerkhof, Marjan;Oldenwening, Marieke;Smit, Henriette A;Brunekreef, Bert;
Institution: Institute for Risk Assessment Sciences, Utrecht University, The Netherlands. [email protected]
Shortcut link to this study:
RATIONALE : The role of air pollution exposure in the development of asthma, allergies, and related symptoms remains unclear, due in part to the limited number of prospective cohort studies with sufficiently long follow-ups addressing this problem.

OBJECTIVES : We studied the association between traffic-related air pollution and the development of asthma, allergy, and related symptoms in a prospective birth cohort study with a unique 8-year follow-up.

METHODS : Annual questionnaire reports of asthma, hay fever, and related symptoms during the first 8 years of life were analyzed for 3,863 children. At age 8, measurements of allergic sensitization and bronchial hyperresponsiveness were performed for subpopulations (n = 1,700 and 936, respectively). Individual exposures to nitrogen dioxide (NO(2)), particulate matter (PM(2.5)), and soot at the birth address were estimated by land-use regression models. Associations between exposure to traffic-related air pollution and repeated measures of health outcomes were assessed by repeated-measures logistic regression analysis. Effects are presented for an interquartile range increase in exposure after adjusting for covariates.

MEASUREMENTS AND MAIN RESULTS : Annual prevalence was 3 to 6% for asthma and 12 to 23% for asthma symptoms. Annual incidence of asthma was 6% at age 1, and 1 to 2% at later ages. PM(2.5) levels were associated with a significant increase in incidence of asthma (odds ratio [OR], 1.28; 95% confidence interval [CI], 1.10-1.49), prevalence of asthma (OR, 1.26; 95% CI, 1.04-1.51), and prevalence of asthma symptoms (OR, 1.15; 95% CI, 1.02-1.28). Findings were similar for NO(2) and soot. Associations were stronger for children who had not moved since birth. Positive associations with hay fever were found in nonmovers only. No associations were found with atopic eczema, allergic sensitization, and bronchial hyperresponsiveness.

CONCLUSIONS : Exposure to traffic-related air pollution may cause asthma in children.
PMID: 19965811

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