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Further, we discuss the magnitude of health problem with respect to chronic obstructive pulmonary diseases (COPD), bronchial asthma and other illnesses.The results of the literature search showed that data has been collected in last 28 years on ambient air quality in Delhi, though it lacks a scientific continuity, consistency of locations and variations in parameters chosen for reporting.
Selected health outcomes include all-cause and cause-specific mortality, respiratory effects, cardiovascular effects, diabetes, and birth outcomes.
The Panel is using a systematic approach to search the literature, assess study quality, summarize results, and reach conclusions about the body of evidence.
Even the parameters studied are varied, as some studies focused on particulate matter ≤10 μm in aerodynamic diameter (PM10) and those ≤2.5 μm in aerodynamic diameter (PM2.5), and others on suspended particulate matter (SPM) and respirable suspended particulate matter (RSPM).
Similarly, the locations of data collection have varied widely.
Some of the sites were at busy traffic intersections, some on the terraces of offices and residential houses and others in university campuses or airports.
As a result, the key question of the extent of pollution and its distribution across various parts of the city could be inferred.
In addition, the quantitative results of the review may be useful for future risk and health impact assessments of traffic-related air pollution.
The Panel formulated criteria for selection of health outcomes in the review, including policy and public health relevance.
The health effects of traffic-related air pollution continues to be of public health interest, with highest exposures in urban settings and residences in proximity to busy roadways.
Following its well-cited 2010 critical review, in 2018 the HEI Board of Directors appointed an expert HEI panel to review the scientific literature on traffic-related air pollution and health (see list of members below).