Air Quality in Kofu City

Kofu City Hall

Monitoring Point

Date

Measurement
Items
Photochemical
Oxidants

Photochemical Oxidants (Ox)

A type of pollutant produced by chemical reactions that occur between nitrogen oxide and organic compounds in the atmosphere due to the effect of UV rays from the sun. Not only does it cause photochemical smog, but it may also irritate mucosa at high concentrations and have negative effects on respiratory organs as well as on plants, including agricultural products.

Measuring unit: ppm

Photochemical Smog Advisory

Yamanashi prefecture announces photochemical smog alert when the level of photochemical oxidant exceeds 0.12ppm and such level is forecast to continue. There are four levels to the alerts declared by the prefecture according to the concentration level of the photochemical oxidant: 1. forecast, 2. advisory, 3. warning, and 4. emergency warning.

Ox
(ppm)
Fine
Particulate
Matter (PM2.5)

Fine Particulate Matter (PM2.5)

PM2.5 is the fine particles in the atmosphere with the size of 2.5 micrometers or smaller in diameter, and it is defined as the particle which passes through a size-selective inlet with a 50 % efficiency cut-off at 2.5 μm aerodynamic diameter.

Measuring unit: μg/m3

PM2.5 Health Warning

Yamanashi Prefecture announces PM2.5 Health Warning when the daily average of PM2.5 is forecast to exceed 70μg/m3.

PM2.5
(μg/m3)
Wind
Direction

Wind Direction (WD)

Wind direction is the direction from which the wind blows, and it is reported in 16 directions on a 16-wind compass rose. For example, a northerly wind blows from the north to the south.

Measuring unit: 16 directions

WD
 
Wind
Speed

Wind Speed (WS)

Wind speed is the rate of distance that air moves per a second. The average wind speed of 10m/s refers to a wind speed for which a gale advisory is announced.

Measuring unit: m/s

WS
(m/s)
Sulfur
Dioxide

Sulfur Dioxide (SO2)

Sulfur dioxide is generated when sulfur-containing fuels such as petroleum and coal are oxidized through the process of combustion. Highly concentrated sulfur oxide may cause negative effects on respiratory organs, and it may also become the cause of acidic precipitation which has a negative impact on forests and lakes.

Measuring unit: ppm

SO2
(ppm)
Nitric
oxide

Nitric oxide (NO)

Nitrogen Oxides refer to a compound of nitrogen and oxygen generated by chemical reactions including general combustion. They primarily take the form of nitrogen oxide (NO) or nitrogen dioxide (NO2) in the atmosphere, and they are produced from various sources including factories/industry, automobiles, and homes. The majority of the nitrogen oxides in the air is first emitted in the form of nitric oxide, and it later turns into nitrogen dioxide through the oxidization process in the atmosphere. Highly concentrated nitrogen dioxide may cause negative effects on respiratory organs, and it may also become the cause of acidic precipitation and photochemical oxidants.

Measuring unit: ppm

NO
(ppm)
Nitrogen
Dioxide

Nitrogen Dioxide (NO2)

Nitrogen Oxides refer to a compound of nitrogen and oxygen generated by chemical reactions including general combustion. They primarily take the form of nitrogen oxide (NO) or nitrogen dioxide (NO2) in the atmosphere, and they are produced from various sources including factories/industry, automobiles, and homes. The majority of the nitrogen oxides in the air is first emitted in the form of nitric oxide, and it later turns into nitrogen dioxide through the oxidization process in the atmosphere. Highly concentrated nitrogen dioxide may cause negative effects on respiratory organs, and it may also become the cause of acidic precipitation and photochemical oxidants.

Measuring unit: ppm

NO2
(ppm)
Nitrogen
Oxides

Nitrogen Oxides (NOx)

Nitrogen Oxides refer to a compound of nitrogen and oxygen generated by chemical reactions including general combustion. They primarily take the form of nitrogen oxide (NO) or nitrogen dioxide (NO2) in the atmosphere, and they are produced from various sources including factories/industry, automobiles, and homes. The majority of the nitrogen oxides in the air is first emitted in the form of nitric oxide, and it later turns into nitrogen dioxide through the oxidization process in the atmosphere. Highly concentrated nitrogen dioxide may cause negative effects on respiratory organs, and it may also become the cause of acidic precipitation and photochemical oxidants.

Measuring unit: ppm

NOx
(ppm)
Carbon
Monoxide

Carbon Monoxide (CO)

Carbon monoxide is produced from the incomplete combustion process of carbon-containing compounds. It is known to bond with the hemoglobin in blood and interfere with the function of hemoglobin as an oxygen carrier. It is also known to extend the lifetime of methane, a type of greenhouse gas, that stays in the air.

Measuring unit: ppm

CO
(ppm)
Non-methane
Hydrocarbon

Non-methane Hydrocarbon (NMHC)

Hydrocarbon is a collective term for the organic compounds of carbon and hydrogen. Non-methane hydrocarbon involved in photochemical reaction is used for evaluating the concentration of hydrocarbon in the atmosphere.

Measuring unit: ppmC

NMHC
(ppmC)
Methane

Methane (CH4)

Hydrocarbon is a collective term for the organic compounds of carbon and hydrogen. Non-methane hydrocarbon involved in photochemical reaction is used for evaluating the concentration of hydrocarbon in the atmosphere.

Measuring unit: ppmC

CH4
(ppmC)
Total
Hydrocarbons

Total Hydrocarbons (THC)

Hydrocarbon is a collective term for the organic compounds of carbon and hydrogen. Non-methane hydrocarbon involved in photochemical reaction is used for evaluating the concentration of hydrocarbon in the atmosphere.

Measuring unit: ppmC

THC
(ppmC)
Suspended
Particulate
Matter

Suspended Particulate Matter (SPM)

Suspended Particulate Matter refers to microscopic dust floating in the air that is 10 micrometers or smaller in diameter. It is produced from sources such as boilers and motor vehicle exhaust. Because it stays in the atmosphere for a long time, it may cause serious effects on the respiratory system through deposition in the lungs and throats.

Measuring unit: mg/m3

SPM
(mg/m3)
1:00-2Calm0.20.0000.0090.0090.30.010
2:004ESE1.20.0000.0080.0080.20.010
3:007Calm0.30.0000.0100.0100.30.010
4:0010E0.80.0000.0090.0090.30.012
5:007Calm0.20.0000.0120.0120.30.006
6:0010ESE0.60.0010.0100.0110.30.013
7:005ESE0.80.0020.0160.0180.30.008
8:007E1.20.0060.0170.0230.30.013
9:005ESE1.00.0070.0150.0220.40.008
10:0022E1.30.0060.0120.0180.30.005
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
24:00

Note

This information is preliminary and subject to revision.
The data may have a negative value because it is a very small amount.

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