The solid sampling technique for analytical method of SO₂ was developed. As this is a solid absorbent method, the flow rate is stable during sampling and pressure loss is small, so that accurate analytical data can be obtained. If 20l of flue gas is sampled, SO₂ concentration can be analyzed by this technique over the range 50-3000 ppm.

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A badge-type sampler for measurement of personal exposures to nitrogen dioxide in ambient air was developed. An absorbent filter containing triethanolamine solution absorbed nitrogen dioxide which diffused through layers of hydrophobic fiber filters. The wind effect on absorption rate was suppressed by the layers of these filters. It could determine the level of nitrogen dioxide of several ten ppb by exposure of several hours. The accuracy was within 20%. It was small (5×4×1 cm³), light (15g) and simple in structure. It could be applied without disturbing the motion of the subject person.

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The developed sampler is examined for measuring out suspended dust to the north, east, south and west winds in measuring period. This sampler is constituted of the four usual samplers, a wind-vane and switch auto-changer replying to the each wind direction. And it is able to separately catch suspended dust on the each filter for the different wind blowing by the developed sampler.
The suspended dust concentrations were five times measure using the developed sampler and the usual sampler at Toyohara Cho in Hiratsuka City for about fourty days from August to September in 1979. And Iron, Lead, Manganese, Vanadium, Titanium, Chromium and Nickel in the caught suspended dust were determined by the Fluorescent X-Ray Spectrometry method.
The concentrations of suspended dust and each metallic element measured by the developed sampler were compared with the value obtained by the usual sampler showed good agreement. When the wind blew from the east or north at the sampling site, the concentrations of air pollutants were shown the maximum affecting the industrial and urban area. On the other hand, the low level concentrations were shown in blowing southerly or westerly from the seaside and the rural country.
Within the results of this study, it was able to suppose the source of suspended dust and each metallic element by the developed sampler and this sampler was very useful.

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NO₂ sorption rate of plants was investigated using sunflower, maize, cucumber, tomato, castor-oil plant and morning glory (Exp. 1). Plants were fumigated with 0.8-1.2 ppm NO₂ for 5 hours in an artificially-lit growth cabinet. A linear relationship between NO₂ sorption rate and transpiration rate per unit water saturation deficit, regardless of plant species tested, was observed.
Effects of long-term fumigation with 0.2 ppm NO₂ on the sorption rate of NO₂ were also examined (Exp. 2). Sunflower, tomato and cucumber were grown for 1-2 months in naturally-lit growth cabinets with NO₂ and without NO₂. Immediately after the long-term NO₂ fumigation, NO₂ sorption rate and transpiration rate were measured under the fumigation with 1 ppm NO₂ for 4 hours in an artificially-lit growth cabinet. Both rates were similar in the long-term treated plants and in control plants. In tomato plants, long-term fumigation caused decrease in leaf area per plant 69% of control. In both experiments 1 and 2, NO₂ concentration in stomatal cavity of leaf surface was estimated to be 0 ppm, even though plants were hurted as tomato plants of experiment 2.

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Easy method of NO₂ measurement used triethanolamine filter paper has been studied by many workers.
In this work, the reliability and accuracy in this method, and many applications were examinea.
1) The scatters of the measured NO₂ concentrations of 10 samples at each station were expressed as nearly normal form distribution, and these in the standard deviation were in about ±20% of average value.
2) The relationship between the sample number N and sampling deviation σ/X was expressed as Log (σ/X) =-0.93 Log N+0.447.
3) The relationship between the capsule NO₂ concentration (μg/5ml) and the daily mean concentration (ppm) of Saltzmann NO₂ meter was expressed by NO₂ (ppm) =0.0125×NO₂ (μg/5ml) +0.0051 with ±20% error of ppm concentration.
4) The relationship between the measured NO₂ concentrations of upward-capsule and the downward-capsule could be cleared the field-influence of NO₂^- mist, particulate contained NO₂^-, etc.

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Concentrations of C₂-O₅ hydrocarbons species measured at various times and places in the United States and in Tokyo have been compared and statistically analyzed. Two groups of hydrocarbons can be distinguished which show high correlations among themselves in both past and present data. The first of these comprise the two butanes and two pentanes, the most volatile part of gasoline. In Tokyo higher ratios of isobutane to n-butane and n-butane to isopentane are seen, probably because of the more widespread use of liquefied petroleum gas in taxicabs in Tokyo as compared to the U.S.A. An increase in the isopentane to n-pentane ratio seems to have occurred around 1970 in the U.S.A.
The three unsaturated compounds ethene, propene and acetylene also showed consistent ratios and generally good correlations with each other. The olefins were depleted somewhat as compared to auto exhaust, perhaps due to atmospheric reactions.

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Distribution of benzo (a) pyrene (BaP) in soil in urban area was investigated with a simple micro-analytical method consisting of ultrasonic extraction, one-dimensional dual band thin-layer chromatography (TLC) and spectrofluorometric determination. The TLC was done in the following condition; Thin-layer plate; Kieselguhr G (4×20 cm)-(26% Acetylated cellulose+Cellulose Avicel SF) (95: 5, w/w, 11×20cm), Developer; Methanol-ether-water (4: 4: 1 v/v).
The results thus obtained were as follows:
1) All samples collected from v arious areas were contained BaP.
2) BaP contents in soils obtained from industrial areas were much higher than those in soils from commercial and residential areas. The contents were 170-6030 ppb in industrial area, 90-4190 ppb in commercial area and 10-1150 ppb in residential area.
3) BaP contents in soils from principal roads were far higher than those from side roads and parks even when side roads and parks located near a principal road. These findings suggest strongly that soils in urban area are polluted by BaP emitted by automobiles.

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Nitrogen oxides in flue gases has been determined by the method of JIS K 0104. But this method occupies much time for determination.
Author improved on the former conventional sample solution adjustment method, and made an experiment on the new methods, annexing oxygen, hydrogen peroxide and sodium hydroxide solution to sample gas.
The results obtained were as follows:
1) Annexing oxygen, hydrogen peroxide and sodium hydroxide solution hastens absorption of nitrogen oxides to absorption solution.
2) In the case that annexed from 30 to 50 ml oxygen and from 0.1 to 3% hydrogen peroxide (solution pH above 10.5) to 150 ml sample gas, and shaken, absorption of nitrogen oxides is achieved within 10 minutes.
3) The results of this method were in good agreement with using JIS K 0104 to boiler or municipal solid waste incinerator exhaust gases.

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