how is the air quality of the area?
Used to have problematic levels of particulates (PM10) due to studded winter tires, but as of 2016 the levels are below limits, after street-specific bans.
Stockholm
used to have problematic levels of particulates (PM10) due to studded winter tires, but as of 2016 the levels are below limits, after street-specific bans. 
who is broder knudtzon? A Norwegian merchant, politician and benefactor. when did he engage with politics? 1814 and how did he do that? He became foreign correspondent of his father's firm Hans Knudtzon & Co, which he owned together with his brother Christian and his brother-in-law Lorentz Johannsen. who is lorentz? A Norwegian merchant and member of the Norwegian Parliament. what does norwegian mean? UNANSWERABLE what was broder merchant of? UNANSWERABLE when did he start mercantile? On his return from Stockholm, he became foreign correspondent of his father's firm Hans Knudtzon & Co where is the place location where he returned from? Stockholm is the capital and most populous urban area of Sweden
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Stockholm [SEP] Air quality
Stockholm used to have problematic levels of particulates (PM10) due to studded winter tires, but as of 2016 the levels are below limits, after street-specific bans. Instead the current (2016) problem is nitrogen oxides emitted by diesel vehicles. In 2016 the average levels for urban background (roof of Torkel Knutssonsgatan) were: NO 11 μg/m, NO 14 μg/m, PM10 12 μg/m, PM2.5 4.9 μg/m, soot 0.4 μg/m, ultrafine particles 6200/cm, CO 0.2 mg/m, SO 0.4 μg/m, ozone 51 μg/m. For urban street level (the densely trafficked Hornsgatan) the average levels were: NO 43 μg/m, NO 104 μg/m, PM10 23 μg/m, PM2.5 5.9 μg/m, soot 1.0 μg/m, ultrafine particles 17100/cm, CO 0.3 mg/m, ozone 31 μg/m.