Kenji Oka
Summary
Measurements  of  indoor and outdoor concentrations for  gaseous nitrous  acid  (HONO)  have  been  performed at a residential  area  (Habikino city)  and an urban site (Osaka city).  Indoor HONO concentrations were higher than outdoors. The mean indoor/outdoor concentration ratios were 1.4 (dusk, night) or 3.5 (day). Indoor and outdoor concentrations for HONO had not a high correlation, R=0.51 at Habikino or 0.40 at Osaka.   Indoor HONO concentrations were found to be well correlated with indoor NO : levels ; HONO concentrations ranged from 8% to 22% of the measured NO : concentrations. These indicates that HONO is produced by NO : reacting with interior surfaces in indoor environments and is decomposed by solar radiation in outdoor. At home using an unvented kerosene space heater, maximum of indoor HONO concentration was 52 ppb and ratios of HONO/NO² ranged from 0.19 to 0.27. 650ppb pKa 3.35
(DOAS HONO + hv
NO OH PAN NO　NO²　H₂O 82rf2cc 2HNO² 2NO² H²O surface HNO² HNO³ 16 1 ll 7cm 0.6cm Fig.1 AF07P 20L/ 20mL Fig.1  Schematic  diagram for the measurements of ambient HOMO. Absorption solution:0.1% Sulfanil Amide/3.6% HCI  20mL Air sampling rate: 20L/min Fig.2   Effect of HCI concentrations in Sulfanil Amide solution on Collection Efficiencies O 1ppm HONO× 20L/min× 30min Amide solution on collection efficienciesies for NO 2 0.4    0.5ppm NO²× 20L/min× 1hr NaI-NaOH 12 / 47mm NaI-1 % NaOH-5% mL mL 1 /10 GB100R
mL 5 lmL 0.1 540nm Fig 2 Fig 3 !!!) 0.5 95 NO NO 50m² ) 300㎡ 3. 1 24 88
17 22 06  4  25 18 Fig.4a 06 44 13,14 55 16 Fig.4b Fig.4a ■ HONO. indoor日NO2. outdoor □ HONO. cutdoor ■ NO2. indoor ● HONONO2. indoor 0 HONONO2 autdoor 1.8ppb (0.9   3.3ppb) 3.7ppb (1.9 5.6ppb) 3.5 (1.9  7.0  ) 1.4 (1.2 4.5 ) Fig.5 ( Habikino-8) Fig6 :11ppb
14 32ppb 20 10ppb 100ppb HONO/ NO 2 30㎡ Fig7 3/29
27
220ppb HONO/NO² 3. 2ん( 13) 50m²) 0.31L/ ) Date 16 10 15 275ppb 5,6 1 51 /
0.06(0.03 0.10) 0.10(0.08   0.12) 0.08(0.06 0.10) ) :028L/ ( 2m 3/13 10 ( HOO Fig7
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