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A letter to the editor is presented which is concerned with compliance with no smoking laws.

Introduction: Our previous 2009 study demonstrated high secondhand smoke levels throughout a public hospital in Budapest., Aim: To compare changes in indoor air pollution level between 2009 and 2012, before and after the Hungarian anti-smoking policy legislation adopted in 2011., Methods: TSI SidePak AM510 Personal Aerosol Monitor was used., Results: In-patient care department PM2.5 levels declined by 92% from 87.7 μg/m3 to 6.9 μg/m3. Non-patient care area PM2.5 level increased by 67% from 64.8 μg/m3 to 108.0 μg/m3. The increase was driven entirely by a large increase in the level in public toilets. Excluding these, there was a 83% drop in PM2.5 in non-patient care areas from 64.8 μg/m3 to 11.1 μg/m3., Conclusions: PM2.5 decreased significantly due to the 2011 law. However, smoking still occurred in the hospital, albeit in less frequently visited areas. A stricter enforcement of this beneficial law is needed to reach a comprehensive smoke-free hospital environment.

Unlabelled: To compare the levels of indoor air pollution found in a sample of smoking and non-smoking public locations in Hungary., Methods: Ambient air of 6 pubs, 5 restaurants, 11 cafes, and 20 other locations in Budapest and Zalakaros, Hungary, between January and August 2008, was studied, and concentration of particulate matter less than 2.5 microns in diameter (PM2.5) was assessed with TSI SidePak AM510 Personal Aerosol Monitor., Results: In 26 places where smoking was observed, the average PM 2.5 level was 102.3 microg/m3 [range: 3-487 microg/m3]; compared to 5.1 microg/m 3 [range: 0-28 microg/m3] in the 16 places where smoking was observed., Conclusions: Levels of indoor fine particle air pollution measured in smoking public locations in Hungary were 18 times higher than the levels in non-smoking places and exceeded the harmful levels declared by the World Health Organization and US Environmental Protection Agency.