Burden of diseases in fifty-three urban agglomerations of India due to particulate matter (PM2.5) exposure

Article information

Environmental Engineering Research. 2022;27(3)
Publication date (electronic) : 2021 April 28
doi : https://doi.org/10.4491/eer.2021.042
1Department of Civil Engineering, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, TS 502285, India
2Department of Climate Change, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, TS 502285, India
Corresponding author: E-mail: ce16resch11001@iith.ac.in, Tel: +91 9309837045
Received 2021 January 20; Accepted 2021 April 26.

Abstract

A nested 3d-chemical transport model, GEOS-Chem, was used to estimate the burden of disease (BoD) from PM2.5 exposure in fifty-three urban agglomerations (UAs) in India with population of 1 million or more, and the contribution of different chemical components to the PM2.5 burden in these locations. Premature mortality due to four diseases (ischemic heart disease, IHD, chronic obstructive pulmonary disease, COPD, stroke and lung cancer) caused by exposure to PM2.5 was estimated using an integrated exposure response function. The studied 53 UAs accounted for approximately 20% of the total premature mortality of 0.54 (0.45–0.63) million in India. Delhi had the maximum premature mortality (11945) followed by Kolkata (9204), Mumbai (8817), Bangalore (4528) Hyderabad (4157) and Chennai (3818). Premature mortality was 2% to 59% higher than the country average in model regions containing UAs. Contribution from different chemical components was in the order: organic carbon (18–30%) > NO3 (8–21%) > SO42− (5–16%) > NH4+ (6–9%) > black carbon (2.5–4%). Our estimates suggest policies targeting multiple compounds are required to achieve large reductions in PM2.5 pollution in urban regions.

1. Introduction

Fine particulate matter with aerodynamic diameter less than 2.5 μm (PM2.5) is a combination of sulfate (SO42−), nitrate (NO3), ammonium (NH4+), black carbon (BC), organic carbon (OC), mineral dust, sea salt aerosols and secondary organic aerosols (SOAs) [1]. It is one of the most important air-borne pollutant, causing adverse cardiovascular, cerebrovascular and respiratory effects. PM2.5 is a major cause of yearly premature mortality worldwide [2]. Sources of particulate matter include volcanoes, dust resuspension, sea-spray, forest fires, biomass burning, mechanical and industrial processes and fossil fuel burning [2].

Urban air pollution from PM2.5 is a major environmental risk to public health [3]. India had fifty-three urban agglomerations (UAs) with a population of 1 million or more in the year 2011 [4]. About 30% of the India population (~377 million) was reported to reside in urban areas. Several projections have been made to assess the extent of premature mortality in the entire country [57], but seldom specifically for urban cities. For example, results from Coupled Model Inter-comparison Project 5 (CMIP5) models have been used to project country-wide premature mortality until the year 2100 under two future representative concentration pathway (RCP) emissions scenarios RCP4.5 and RCP8.5, and five shared socioeconomic pathways (SSPs) for population [5]. In another study, the country was divided into six broad regions and the estimated premature mortality from exposure to PM2.5 in 2012 was estimated to be approximately 1.1 million [6]. The proportion of the premature mortality occurring in UAs has not been evaluated, although the UAs are well accepted to be proportionally more polluted than other regions.

A majority of studies on understanding air pollution in individual cities have focused on the national capital, New Delhi [e.g., [5, 8, 9]]. Other cities have not received as much attention even though they would account for a profound majority of urban population. In a recent study, field-observed PM10 data were used with a scaling factor to estimate PM2.5 for twenty-nine cities and it was concluded that the most important cause for premature mortality was ischemic heart disease, followed by stroke, chronic obstructive pulmonary disease, lower respiratory infection and lung cancer [10]. However, contribution of different chemical components to PM2.5 and premature mortality was not assessed.

In this work, we used a nested chemical transport model (GEOS-Chem) to determine the premature mortality [by ischemic heart disease (IHD), chronic obstructive pulmonary disease (COPD), stroke and lung cancer (LC)] due to PM2.5 exposure in 53 UAs of India for the year 2010. We then estimated the contribution of different chemical components of PM2.5 (SO42−, NO3, NH4+, BC and OC) to the monthly, seasonal and annual PM2.5 concentrations in each UA. The impact of these 5 chemical components of PM2.5 on the premature mortalities in 53 UA of India was also performed. Quantification of the contribution of different components may help in prioritizing city-specific, activity-specific, emission control technologies within any broad emission category (e.g., power plants or vehicular transportation).

2. Materials and Methods

2.1. Model Description and Setup

GEOS-Chem is a 3-dimensional atmospheric chemical transport model (http://acmg.seas.harvard.edu/geos/) driven by assimilated meteorological data from the Goddard Earth Observing System (GEOS). We simulated PM2.5 concentrations over India using the 0.5° × 0.625° Asian nested grid in GEOS-Chem version v12.1.1 (11°S–55°N, 60°E–150°E) for the year 2010, which uses MERRA2 meteorological data. Boundary conditions for the nested simulation were generated every 3 h from the global 4° × 5° version of the model [11]. Fully coupled simulations included O3-NOx-hydrocarbon chemistry, aerosols and gas-aerosol phase partitioning, and dry and wet deposition schemes [1218].

Global anthropogenic emissions were from the Community Emissions Data System (CEDS) except for NH3 emissions, which were from the Global Emission Initiative (GEIA) inventory [19]. Anthropogenic emissions over the Asian region (nested grid) were from MIX inventory [20]. The MIX emission inventory for 2010 considers ten species [SO2, NOx, NH3, CO, non-methane volatile organic carbon (NMVOC), PM10, PM2.5, BC, OC and CO2] from five different sectors (residential, industry, power, transport and agriculture) [20]. Total anthropogenic and natural emissions over the Indian region are presented in the Supplementary Material (Table S1 and Fig. S1). Each simulation was made for 18 months, with the first 6 months as spin-up for both global (4° × 5°) and the nested (0.5° × 0.625°) models [21].

Model outputs were saved at monthly resolution and included total PM2.5 concentrations in each model grid, and the concentrations of different components of PM2.5 (SO42−, NO3, NH4+, BC, OC, SOA, mineral dust and sea salt aerosols). From this, the percent contributions by chemical components (SO42−, NO3, NH4+, BC and OC) to PM2.5 concentrations were estimated because understanding the variation in the concentration of different components and their relationship with the emissions, helps in generating policies for the future [1]. The premature mortalities in each model region containing UAs were also calculated.

A population-weighted annual mean PM2.5 concentration for the entire country was calculated as:

(1) Population-weightedPM2.5=i=1NPM2.5×Pii=1NPi

Population-weighted concentration (for individual grid i ranging from 1 to N) is the mean concentration to which the entire country population (P) may be exposed to PM2.5 (μg m−3) [22] and accounts for the variation in spatial and temporal distribution of PM2.5 [23].

2.2. Observational and Satellite Data for Comparison

We compared GEOS-Chem simulated PM2.5, SO2 and NO2 concentrations with observed annual mean concentrations of PM.2.5 (at eleven sites, Table S2), SO2 and NO2 (at 48 UAs) in 2010 by the National Ambient Air Quality Monitoring Programme, NAMP [24]. Details on locations and observed concentrations of SO2 and NO2 are presented in the Supplementary Material (Table S3 and S4). As ground-based observations for PM2.5 were scarce, re-gridded satellite derived concentrations obtained from the aerosol optical depth (AOD) values retrieved from Moderate Resolution Imaging Spectroradiometer (MODIS), Multi-angle Imaging Spectroradiometer (MISR) and Sea-Viewing Wide Field-of-View Sensor (SeaWiFS) [25] were also used. Normalized mean bias (NMB) (Eq. (2)) and coefficients of correlation (r) of model (M) predicted PM2.5, SO2 and NO2 concentrations with the corresponding ground-based or satellite-based observations (O) were determined.

(2) NMB=100×1n(M-O)1n(O)

2.3. Estimation of Premature Mortality due to PM2.5 Exposure and Contribution of Chemical Components to PM2.5

Four diseases IHD, COPD, stroke and LC were used as endpoints because of their direct link with ambient PM2.5 exposure [2628]. Relative risks of these diseases were calculated for each model grid using a non-linear Integrated Exposure Response (IER) function [5, 2931]:

(3) RRi,j=1+αj[1-exp(-γj(ΔPM2.5)iδj)
(4) RRi,j=1(IfPM2.5<5.8μgm-3)

Where RRi,j represents the relative risk for a disease j at a model grid i. ΔPM2.5 is the difference between the modeled PM2.5 concentration (μg m−3) in the ith grid and the counterfactual PM2.5 concentration, 5.8 μg m−3 [31]. The counterfactual PM2.5 concentration is the amount of PM2.5 below which no risk exists (i.e. RR ≤ 1) [31]. A range of 1,000 sets of disease specific constants (αj, γj, δj) were obtained from the Monte Carlo simulation performed by Burnett et al. [30]. The median and 95% confidence limits (CLs) of these constants are presented in Table S5. Premature mortality per year, ΔMi,j, is given by [30, 32]:

(5) i,j=1NΔMi,j=i,j=1Nyi,j×i=1NRRi,j-1i=1NRRi,j×i=1NPi

Where yi,j is the baseline mortality (unitless), RRi,j is the relative risk for specific disease j at modelled grid (i to N) and Pi is the exposed population for 2010. The 2010 total population information was obtained from 2011 census data [33]. The 0.5° × 0.5° gridded population for the year 2010 was obtained from the Shared Socioeconomic Pathways (SSP) scenarios (https://tntcat.iiasa.ac.at/SspD, last accessed 8 October, 2020) and regridded to the simulation resolution (0.5° × 0.625°). The baseline mortality was quantified using the number of deaths in India for 2010 from the Global Health Database Exchange [http://ghdx.healthdata.org, last accessed 03 July, 2020; data is provided by the Office of the Registrar General and Census Commissioner, India (2014)].

The impact of individual chemical components of PM2.5 on the premature mortality was estimated by first subtracting the individual component from the actual PM2.5 concentration in the respective UA location. Later the premature mortality by 4 different diseases (COPD, IHD, lung cancer and stroke) at these UAs of India from the obtained PM2.5 concentration was determined by using IER function. The total premature mortality due to a specific chemical constituent is estimated by deducing the premature mortality estimated in absence of the specific chemical component from the total premature mortality value.

3. Results

3.1. Model Results and Country-Wide Analysis

Overall country-wide results were similar to other previous studies. Population weighted mean concentration of PM2.5 was 66.2 μg m−3, approximately 12% lower than Ghude et al. [7], 2016 (75 μg m−3 in 2011), David et al. [6], 2019 (75.5 μg m−3 in 2012), Venkataraman et al. [34], 2018 (~75 μg m−3 in 2015) and 10% higher than Cohen et al. [35], 2017 (60 μg m−3 in 1990), but within the percent variation (~7–15%) reported from multiple studies [6]. 99.5% of the total population in India was exposed to an annual mean PM2.5 concentration greater than the WHO air quality guidelines (annual mean concentration of 10 μg m−3); [36], similar to earlier results [6, 34, 37].

The highest mean surface concentrations of PM2.5 were observed during DJF (December-January-February) followed by SON (September-October-November), MAM (March-April-May) and JJA (June-July-August) (Fig. 1). A decrease in the concentration of PM2.5 and its precursors during JJA occurs due to precipitation and washout or wet deposition of pollutants in the atmosphere whereas a peak in the concentrations during DJF in India occurs due to low temperatures and low mixing heights [38] limiting the dispersion of pollutants.

Fig. 1

(a) Spatial and seasonal variation in the concentration (μg m−3) of PM2.5 with the inset values as the seasonal mean concentration of PM2.5 and (b) the seasonal mean concentration of different components of PM2.5 for the year 2010 in India.

The annual average concentrations of NO3, NH4+, SO42−, BC, OC, SOA, mineral dust, and sea salt aerosols over India for the year 2010 were estimated as 6.90 μg m−3, 3.92 μg m−3, 5.21 μg m−3, 1.7 μg m−3, 5.1 μg m−3, 7.2 μg m−3, 10.38 μg m−3 and 0.21 μg m−3, respectively. The percent contribution of sulfate-nitrate-ammonium (SNA) to PM2.5 over India was observed to be 40% (with NO3 contributing by as 16%, SO42− by 14% and NH4+ by 10% to PM2.5 concentration). OC concentration contributed 21% to PM2.5 followed by mineral dust (18%), secondary organic aerosols (17%), BC (3%) and sea salt aerosols (1%). The northern Indian region (mainly the IGP region) has the highest ambient PM2.5 concentration, similar to other studies [6]. Fig. S2 and S3 present the annual spatial and monthly mean variations in the concentrations of various chemical constituents (NO3, NH4+, SO42−, BC and OC) of PM2.5 in India. The Indo-Gangetic plains were observed to have high concentrations of different chemical constituents of PM2.5.

Further discussions on comparison of model results with field-observed and satellite-derived concentrations and related discussions are presented in Section S1 and Fig. S4 and, on premature mortality in India as a whole in Section S2. The total premature mortality in India was 0.54 (0.45–0.63) million (Table S6), comparable to previous reports [0.57 (0.32–0.73) million [7] and 0.567 million [39]]. Maximum premature mortality was observed in the Indo-Gangetic region (Fig. S5).

3.2. PM2.5 and Premature Mortality in the 53 UAs of India

The annual average concentration of PM2.5 in all the UAs were > 10 μg m−3 (range 26.06–144.33 μg m−3). Fig. 2(a) and Table S7 show the premature mortalities obtained in the UAs for 2010. The total number of premature mortality due to PM2.5 exposure in these UAs was 0.10 (0.09–0.125) million for the year 2010. Delhi had the highest mortality (11945), followed by Kolkata (9204), Mumbai (8817), Bangalore (4528) Hyderabad (4157) and Chennai (3818). Together these cities account for 7.86% of the total premature mortalities in India and 42.47% of total premature mortalities in UAs.

Fig. 2

(a) Premature mortality and (b) percent BoD with respect to the population in 53 UAs of India.

Fig. 2(b) and Table S8 show the premature mortality per capita, i.e. the mortality per population due to PM2.5 exposure in each UA. This number is directly related to the PM2.5 concentrations in each UA [see Eq. (3), [39]]; the higher the PM2.5 concentrations (Fig. 4) the higher will be the premature mortality per capita. The most vulnerable UAs are Delhi, Kolkata, Lucknow, Kanpur, Ghaziabad, Patna, Agra, Ludhiana, Faridabad, Meerut, Jamshedpur, Asansol, Allahabad, Amritsar and Dhanbad, with 0.065% premature mortality per capita. All these are higher than the country average of 0.047% premature mortality per capita. That is, premature mortality due to PM2.5 exposure was 2% to 59% higher in the regions containing UAs than the country average. Across all the cities, the causes of mortalities were Stroke ≈ IHD > COPD > LC (Fig. S6).

Fig. 4

(a)The annual mean concentration of the chemical components of PM2.5 and (b) the percent contribution of these chemical components to PM2.5 at the 53 UAs of India for the year 2010.

The premature mortality with respect to population in the rural regions ranged from 0.02% to 0.069% with the average of 0.052% (Section S3, Table S9–S11, Fig. S7–S8; rural regions obtained from the Ministry of Jal Shakti, Government of India, website, https://ejalshakti.gov.in/IMISReports/Reports/BasicInformation/rpt_RWS_RuralPopulation_S.aspx?Rep=0&RP=Y, last accessed 05 April, 2021; [40, 41]). The annual average PM2.5 concentrations in these rural sites was 50.1 μg m−3 (12.5 μg m−3 at Pangi region of Chamba district of Himachal Pradesh to 105.33 μg m−3 at Jakhal region of Fatehabad of Haryana state). As can be seen, some values were lower than the country average of 0.047% and some were higher (1.2–50.6%) than the country average. We then plotted the PM2.5 concentrations in UAs and rural regions by five administrative zones of India (northern, southern, eastern, western and central India as shown in Fig. S8). It is seen that PM2.5 concentrations in rural regions in southern and eastern India do not statistically differ from those in UAs (Fig. S9). Whereas, in the northern, western and central India the PM2.5 concentrations in rural regions were lower than UAs at p < 0.05. When observed together with the spatial annual mean concentrations of NO3, NH4+, SO42−, BC and OC, and the overall seasonal PM2.5 map (Fig. 1), it appears that the pollution from PM2.5 is largely zonal. That is, in most cases, the percent BoD would be similar in rural, semi-urban and urban locations that belong to one particular region, and the absolute premature mortality then essentially dependent on the absolute population residing in that region. Therefore, pollution reduction measures taken in certain high emission regions of a particular zone may be beneficial to the entire zone.

3.3. Premature Mortality due to the Different Constituents of PM2.5

Fig. 3 and Table S12 present the premature mortality contributed by different chemical components of PM2.5 in India for the simulated year 2010. Cities like Delhi, Kolkata, Surat, Mumbai, Hyderabad, Chennai, Bangalore and Ahmedabad had the premature mortalities ranging from 337 to 1,136 by OC, 215 to 996 by NO3, 210 to 828 by SO42−, 150 to 625 by NH4+ and 51 to 567 by BC respectively. The contribution of differnet chemical components was in the order: OC > NO3 > SO42− > NH4+ > BC. Pemature mortality due to NO3, NH4+ and OC are proportionately much higer in the Indo-Gangetic Plains (Fig. 3), which could be attributable to vehicular, agrilcutural and biomass burning emissions (e.g. [34]). Premature mortality due to SO42− coincides relatively well with the locations of coal-fired power plants (e.g., in Jharkhand, greater Delhi region, Uttar Pradesh and Maharashtra).

Fig. 3

The impact of different chemical components on the premature mortality due to PM2.5 in India during 2010.

3.4. Composition of PM2.5 and Implications for Remedial Actions

Fig. 4(a) and Fig. 4(b) present the concentrations and the contribution of SO42−, NO3, NH4+, BC and OC on PM2.5 for the UAs of India for the year 2010. OC concentration contributed the most (18–30%) to the total PM2.5 concentration, followed by NO3 (10–28%), SO42− (7–21%), NH4+ (7–12%) and BC (2.5–4%), respectively for the different UAs. In general, strategies to reduce OC and NOx pollution may be expected to yield health benefits across all the cities. Furthermore, measures that target the residential or biomass burning [42], and transportation sector should lead to benefits in most UAs.

However, measures to reduce the impact of NO3 should be applied across all major categories of transportation (buses, taxis, cars, private, public). For example, cities like Delhi have implemented short-duration odd-even schemes in the past whereby all private four-wheelers with an odd registration numbers are allowed to be on-road one day and even registration numbers on the next day. And the most recent scheme applied between November 5 and 15, 2019, had several concessions, with restrictions being applicable only between 8 am and 8 pm, with exemptions for female drivers with children up to age 12, vehicles with physically disabled person and elderly people and on Sundays. These schemes have been applied to obtain short-term improvement in air quality and their long-term effectiveness has been judged to be marginal only [43, 44].

If we assume that such a scheme is applied consistently throughout the year, considering 48% of NO2 contribution from passenger vehicles [45] and 33% from cars and jeep [43], an overall NO2 reduction of the order of 8% can be expected if half of the cars and jeep were removed from the roads. NO3 contributed approximately 16% to total PM2.5 concentrations in Delhi region in our model results and an overall 1.3% reduction of PM2.5 concentration can be expected. Model predicted PM2.5 and NO2 concentrations for the Delhi grid will be 66.87 μg m−3 and 7.72 μg m−3, respectively, which are comparable to the measured PM2.5 and NO2 concentrations by CPCB, 79–507 μg m−3 and 9–159 μg m−3, respectively during the 1st to 15th January 2016 (http://cpcbenvis.nic.in/pdf/CPCB%20Report%20on%20Odd-Even%20Scheme.pdf). Thus, even though our 1.3% reduction calculations are derived using assumptions, they suggest that such odd-even schemes applied to a small section of overall traffic will not lead to high reductions; instead, they may be more useful in reducing traffic congestion and travel times [43]. Further considering the natural variability in measurements, such reductions may not be observed at a statistically significant level. In contrast, switching to tighter emissions norms [such as under the Bharat Stage (BS)-VI], introduced on 1st April 2020, will reduce NOx emissions from petrol-driven vehicles by 25% and from diesel-driven vehicles by 68%. Therefore, here, more than 10% reduction in PM2.5 can be expected due to local NOx emissions reductions alone.

SO2 emissions are largely driven by the industrial and power sectors, and their contribution to urban PM2.5 load is variable (10–30%). However, technologies such as flue gas desulfurization (FGD) installed in all coal-fired power plants [46] can remove as much as 90% of this contribution.

Contributions of NH4+, BC and OC to PM2.5 are consistent across all analyzed UAs (total 35–50%) and are primarily influenced by the residential sector (like emissions from traditional stove, biofuels, cow dung and agricultural waste used for cooking). This is consistent with previous country-wide model results that the residential sector could account for 52% of population-weighted annual mean PM2.5 concentrations [37]. The percent premature mortality is much higher in urban areas (2–59%) than the country-wide estimate. Therefore, a move away from low efficiency combustion of domestic fuels [47], limiting biomass burning during winters and alternative power sources such as diesel generators would substantially reduce PM2.5 pollution, and the associated exposure and premature mortality in urban regions as well as the entire country.

As such, our analysis shows policies targeting multiple sectors would lead to larger reductions in PM2.5 pollution in urban regions (reductions of more than 19–30%) compared to policies in a single sector alone. Overall, a multi-pronged approach will be required to improve the overall air quality of urban regions.

4. Conclusions

The premature mortality from PM2.5 exposure was estimated to be 0.54 million for India in 2010 and 0.1 (0.09–0.125) million for the 53 considered UAs. Delhi had the highest premature mortality followed by Kolkata, Mumbai, Bangalore, Hyderabad and Chennai, accounting for 7.5% of the total premature mortalities in India and 47.6% of the total premature mortalities of all the UAs from PM2.5 exposure. The cause of mortality in the UAs was Stroke ≈ IHD > COPD > LC. The health effects of the chemical components of PM2.5 showed a trend of OC having higher contribution towards the total premature mortality in India followed by NO3, SO42−, NH4+ and BC respectively. Multiple source-specific remedial measures such as implementation of new vehicular emission norms (for example, BS-VI standards), installation of FGDs in power plants and robust actions to control the emissions from the unregulated sources (residential and biomass burning) near urban regions could lead to a reduction of 19–30% of the PM2.5 concentrations in these regions.

Supplementary Information

Acknowledgments

The MERRA-2 data used in this study/project have been provided by the Global Modeling and Assimilation Office (GMAO) at NASA Goddard Space Flight Center. Contents and views expressed in this manuscript are of the authors alone and do not necessarily reflect the views of IIT Hyderabad.

Notes

Author Contributions

A.Q. (Associate Professor) initiated the study, wrote and edited the manuscript. P.S. (Ph.D. Scholar) conceptualized the plan, performed simulations, visualized the data, wrote and edited the manuscript.

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Fig. 1

(a) Spatial and seasonal variation in the concentration (μg m−3) of PM2.5 with the inset values as the seasonal mean concentration of PM2.5 and (b) the seasonal mean concentration of different components of PM2.5 for the year 2010 in India.

Fig. 2

(a) Premature mortality and (b) percent BoD with respect to the population in 53 UAs of India.

Fig. 3

The impact of different chemical components on the premature mortality due to PM2.5 in India during 2010.

Fig. 4

(a)The annual mean concentration of the chemical components of PM2.5 and (b) the percent contribution of these chemical components to PM2.5 at the 53 UAs of India for the year 2010.