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As the sluggish external market demand and excess domestic investment in past years have caused excess production capacity, resulting in both industrial growth rate and GDP growth rate falling to lowest point for the last three years in China. Where would China's economy go? China's Macroeconomic Outlook, August 2013 provides some insights into the details of the economic development in China, and also includes series of simulations of the impact of decreasing government revenue on the economic performance. The research suggests that China should cut its government revenue share in GDP to promote its structural adjustment

Owing to the decline in domestic investment and trade with the rest of the world, China's real GDP in the first half of 2012 was lower than expected. Based on forecasts from China's Quarterly Macroeconomic Model (CQMM), the slowdown of the growth rate in 2013 will be moderate as a result of modestly proactive macro control policy. GDP would grow at 8.01 percent in 2012, and then rebound to 8.29 in 2013; CPI would fall to a 2.9 percent in 2012, and then would pick up to 3.27 percent in 2013. In the scenario in which the sovereign debt crisis in the euro area worsened in the second half of 2012, real GDP is forecast at 7.71 percent for 2012 and 7.5 percent for 2013. Even if the external economic environment becomes worse, China's growth is expected to stay at above 7.5 percent, which might be a steady growth rate for the near future. If China plans to achieve a higher growth rate by launching the "2 trillion massive investment package", the growth rate of GDP could be increased to 8.25 and 8.86 percent in 2012 and 2013 with a risk of inflation and worsening economic structure. The policy implication from CQMM: on one hand the Chinese government should be able to maintain the growth rate of around 8 percent by means of timely fine-tuning of monetary policies; on the other hand, the emphasis of the micro control should be placed on structural adjustments through fiscal policies. In the long run, deepening economic, social and institutional reform will be crucial to remove the significant structural imbalance and institutional barriers to market competition, to accelerate the transformation of economic development patterns, and finally to maintain a sustainable growth rate.

To mitigate the impacts of the pandemic of coronavirus disease 2019 (COVID-19), the Indian government implemented lockdown measures on 24 March 2020, which prohibited unnecessary anthropogenic activities, thus leading to a significant reduction in emissions. To investigate the impacts of this lockdown measure on air quality in India, we used the Community Multi-Scale Air Quality (CMAQ) model to estimate the changes of key air pollutants. From pre-lockdown to lockdown periods, improved air quality is observed in India, indicated by the lower key pollutant levels such as PM 2.5 ( − 26 %), maximum daily 8 h average ozone (MDA8 O 3 ) ( − 11 %), NO 2 ( − 50 %), and SO 2 ( − 14 %). In addition, changes in these pollutants show distinct spatial variations with the more important decrease in northern and western India. During the lockdown, our results illustrate that such emission reductions play a positive role in the improvement of air quality. Significant reductions of PM 2.5 concentration and its major components are predicted, especially for secondary inorganic aerosols that are up to 92 %, 57 %, and 79 % for nitrate (NO 3- ), sulfate (SO 42- ), and ammonium (NH 4+ ), respectively. On average, the MDA8 O 3 also decreases 15 % during the lockdown period although it increases slightly in some VOC-limited urban locations, which is mainly due to the more significant reduction of NO x than VOCs. More aggressive and localized emission control strategies should be implemented in India to mitigate air pollution in the future.

To mitigate the impacts of the pandemic of coronavirus disease 2019 (COVID-19), the Indian government implemented lockdown measures on 24 March 2020, which prohibited unnecessary anthropogenic activities, thus leading to a significant reduction in emissions. To investigate the impacts of this lockdown measure on air quality in India, we used the Community Multi-Scale Air Quality (CMAQ) model to estimate the changes of key air pollutants. From pre-lockdown to lockdown periods, improved air quality is observed in India, indicated by the lower key pollutant levels such as PM2.5 (−26 %), maximum daily 8 h average ozone (MDA8 O3) (−11 %), NO2 (−50 %), and SO2 (−14 %). In addition, changes in these pollutants show distinct spatial variations with the more important decrease in northern and western India. During the lockdown, our results illustrate that such emission reductions play a positive role in the improvement of air quality. Significant reductions of PM2.5 concentration and its major components are predicted, especially for secondary inorganic aerosols that are up to 92 %, 57 %, and 79 % for nitrate (NO 3-), sulfate (SO 42-), and ammonium (NH 4+), respectively. On average, the MDA8 O3 also decreases 15 % during the lockdown period although it increases slightly in some VOC-limited urban locations, which is mainly due to the more significant reduction of NOx than VOCs. More aggressive and localized emission control strategies should be implemented in India to mitigate air pollution in the future.

To mitigate the impacts of the pandemic of coronavirus disease 2019 (COVID-19), the Indian government implemented lockdown measures on March 24, 2020, which prohibit unnecessary anthropogenic activities and thus leading to a significant reduction in emissions. To investigate the impacts of this lockdown measures on air quality in India, we used the Community Multi-Scale Air Quality (CMAQ) model to estimate the changes of key air pollutants. From pre-lockdown to lockdown periods, improved air quality is observed in India, indicated by the lower key pollutant levels such as PM 2.5 (−26 %), maximum daily 8-h average ozone (MDA8 O 3 ) (−11 %), NO 2 (−50 %), and SO 2 (−14 %). In addition, changes in these pollutants show distinct spatial variations with the more important decrease in northern and western India. During the lockdown, our results illustrate that such emission reductions play a positive role in the improvement of air quality. Significant reductions of PM 2.5 and its major components are observed especially for secondary inorganic aerosols with the decreasing rates up to 92 %, 57 %, and 79 % for nitrate (NO 3 − ), sulfate (SO 4 2− ), ammonium (NH 4 + ), respectively. On average, the MDA8 O 3 also decreases 15 % during the lockdown period although it increases sparsely in some urban locations, which is mainly due to the lower NO x and VOCs emissions. More aggressive and localized emissions control strategies should be implemented in India to mitigate air pollutions in the future.