The surface ozone, oxides of nitrogen (NO_x)_, and carbon monoxide (CO) were measured from 2015 to 2016 at a mountain site of the Indian western Himalayan region to study the temporal variability of ozone and the influence of precursor gases and meteorological parameters. Ozone showed anti-correlation with NO_x and CO, indicating its photochemical origin. Significant variabilities were recorded in the annual mean values of these species during 2015 & 2016. The NO _x showed ~60% fall in the mean annual concentration in 2016 compared to 2015, while a 17% increase in CO concentration and a 27% fall in mean ozone level were recorded in 2016. The observed variabilities could be due to change in wind speed, as a ~ 50% drop was recorded in the mean wind speed in 2016. The cluster analysis showed that the site received maximum air masses from the southeast to northwest directions where point sources are also located. The influence of biomass burning in Indo-Gangetic Plains (IGP) region, along with strong valley to mountain wind flow was also observed. The high values of NO _x and CO observed in 2015 may be attributed to industrial activities and meteorology in this region.

2015 年至 2016 年在印度喜马拉雅西部山区的一个山区测量了地表臭氧、氮氧化物 (NO _x )_和一氧化碳 (CO)，以研究臭氧的时间变化以及前体气体和气象参数的影响. _{臭氧显示出与 NO x}和 CO的反相关性，表明其光化学起源。在 2015 年和 2016 年期间，这些物种的年平均值出现了显着变化。NO _x与 2015 年相比，2016 年的年平均浓度下降了约 60%，而 2016 年记录的二氧化碳浓度增加了 17%，平均臭氧水平下降了 27%。观察到的变化可能是由于风速的变化， 2016 年平均风速下降了约 50%。聚类分析表明，该站点从东南到西北方向接收到最大气团，点源也位于该方向。还观察到印度恒河平原（IGP）地区生物质燃烧的影响，以及强谷到山的风流。2015 年观测到的高 NO _x和 CO 值可能归因于该地区的工业活动和气象。