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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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Also add information on how to contact you by electronic and paper mail.
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This General Public License does not permit incorporating your program into
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library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License.

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# purpleair
Get air quality readings from [PurpleAir](http://purpleair.com) sensors.
![](purpleair.png)
# Requirements
Dependencies: perl, curl, jq
# Configuration
A purpleair config block looks like this:
```INI
[purpleair]
label=
command=$SCRIPT_DIR/purpleair
interval=60
SENSOR_ID=78305
#TYPE=US_AQI
#COLORS=#85df56,#fbcf4b,#f28c33,#dd4d3c,#cf79e0,#9b2f6a
#NO_COLOR=true
```
## Finding a sensor ID
If you do not own a PurpleAir sensor, there may be one near you that you can query. Here's how to find a sensor ID:
1. Navigate to http://purpleair.com/map and find a reading near you.
1. Click on the reading to bring up a details card. (Note, sensors with a block border are indoors. You'll likely want a plain circle).
1. At the bottom of the card, hover over "Get This Widget", and click the "JSON" link.
1. The sensor ID is the value of the URL's "show" query parameter.
If you own a PurpleAir sensor, use its ID. If your sensor is configured to be private, see the [PurpleAir FAQ](https://www2.purpleair.com/community/faq#hc-access-the-json) for extra access requirements. If your sensor is public and you do not know its ID, see the instructions above to find it.
## Configuration Parameters
There is one required parameter, along with some optional ones:
Parameter | Description
--------- | -----------
SENSOR_ID | Required: The PurpleAir sensor to query
TYPE | Optional: The air quality computation to perform. Default: US_AQI
COLORS | Optional: Comma-separated list of color hex values to use in place of the default colors
NO_COLOR | Optional: Any non-empty value causes color to be suppressed
### TYPE
The valid values for `TYPE` are:
Type | Description
------- | -----------
US_AQI | [United States Air Quality Index](https://www.airnow.gov/aqi/aqi-basics/)
EU_AQI | [European Air Quality Index](https://airindex.eea.europa.eu/)
CA_AQHI | [Canada Air Quality Health Index](https://www.canada.ca/en/environment-climate-change/services/air-quality-health-index/about.html)
IMECA | [Índice MEtropolitano de la Calidad del Aire](https://www.gob.mx/comisionambiental/es/articulos/imeca-indice-metropolitano-de-la-calidad-del-aire)
IAS | [Índice de Aire y Salud](http://www.aire.cdmx.gob.mx/default.php?opc=%27ZaBhnmI=&dc=%27Zw==)
### COLORS
The `COLORS` parameter should be specified without spaces or quotes.
Good: `COLORS=#ffffff,#aaaaaa,#888888`
Bad: `COLORS="#ffffff,#aaaaaa,#888888"`
Bad: `COLORS=#ffffff, #aaaaaa, #888888`
If fewer colors are specified than the `TYPE` uses by default, a warning will be printed to `stderr`. Also, any color index higher than the maximum index given will be reduced to the maximum index.
### NO_COLOR
The `NO_COLOR` parameter suppresses colors, so the output will use the default output color of the bar.
Any non-empty value will trigger its effect, but by convention it should be specified `NO_COLOR=true`.

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[purpleair]
label=
command=$SCRIPT_DIR/purpleair
interval=60
SENSOR_ID=78305
TYPE=US_AQI
COLORS=#85df56,#fbcf4b,#f28c33,#dd4d3c,#cf79e0,#9b2f6a

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#!/bin/perl
# For temperature: subtract 8 from the F value for the actual temperature
# Get PurpleAir sensor ID
if ($ENV{'SENSOR_ID'} == "") {
print STDERR "Missing required environment variable 'SENSOR_ID'.\n";
exit 1;
}
$sensor_id = $ENV{'SENSOR_ID'};
# Get measurement type. Default: US_AQI
@valid_types = ("US_AQI", "EU_AQI", "CA_AQHI", "IMECA", "IAS");
$type = 'US_AQI';
if (grep(/^$ENV{'TYPE'}$/, @valid_types)) {
$type = $ENV{'TYPE'};
} elsif ($ENV{'TYPE'}) {
print STDERR "Unrecognized TYPE: $ENV{'TYPE'}. Valid values are: [@valid_types]";
exit 1;
}
# Read pm2.5 10-minute average from the PurpleAir sensor
$pm2_5 = `curl "http://purpleair.com/json?show=$sensor_id" 2>/dev/null \\
| jq -r '.results | map(select(has("Stats")) | .Stats | fromjson | .v1) | add / length'`;
###################
# IMPLEMENTATIONS #
###################
sub UsAqi {
# See https://forum.airnowtech.org/t/the-aqi-equation/169
#
# PM2.5 | ConcLo | ConcHi | AQILo | AQIHi
# Good | 0.0 | 12.0 | 0 | 50
# Moderate | 12.1 | 35.4 | 51 | 100
# Unhealthy Sensitive | 35.5 | 55.4 | 101 | 150
# Unhealthy | 55.5 | 150.4 | 151 | 200
# Very Unhealthy | 150.5 | 250.4 | 201 | 300
# Hazardous | 250.5 | 500.4 | 301 | 500
#
# |------------Multiplier-----------| Threshold Addition
# (AQIHi - AQILo) / (ConcHi - ConcLo) * (ConcNow - ConcLo) + AQILo
@colors = ("#00e400", "#ffff00", "#ff7e00", "#ff0000", "#8f3f97", "#7e0023");
$pm2_5 = $_[0];
# Table of values: Threshold, Multiplier, Addition
@t = (
[0.0, 4.1667, 0.0],
[12.1, 2.1030, 51],
[35.5, 2.4623, 101],
[55.5, 0.5163, 151],
[150.5, 0.9910, 201],
[250.5, 0.7963, 301]
);
# Find relevant row for computation based on pm2.5 threshold
for ($i = 5; $i >= 0; $i--) {
if ($pm2_5 >= $t[$i][0]) {
$r = $i;
last;
}
}
# Compute AQI from raw pm2.5 concentration
$aqi = $t[$r][1] * ($pm2_5 - $t[$r][0]) + $t[$r][2];
return (
'val' => sprintf("%.0f", $aqi),
'colors' => [@colors],
'color_idx' => $r
);
}
sub EuAqi {
# See https://airindex.eea.europa.eu/Map/AQI/Viewer/
# European Air Quality Index uses the pm2.5 concentration directly.
@colors = ("#50f0e6", "#50ccaa", "#f0e641", "#ff5050", "#960032", "#7d2181");
$pm2_5 = $_[0];
# Thresholds for color indices
@t = (0.0, 10.0, 20.0, 25.0, 50.0, 75.0);
# Find relevant row for computation based on pm2.5 threshold
for ($i = 5; $i >= 0; $i--) {
if ($pm2_5 >= $t[$i]) {
$r = $i;
last;
}
}
return (
'val' => sprintf("%.0f", $pm2_5),
'colors' => [@colors],
'color_idx' => $r
);
}
sub CaAqhi {
# See https://en.wikipedia.org/wiki/Air_Quality_Health_Index_(Canada)#Calculation
# Note: AQHI should also incorporate O3 and NO2, but PurpleAir only has PM2.5
# The pm2.5 calculation is used alone and multiplied by 3.
# 1-3: Low
# 4-6: Moderate
# 7-10: High
# 11+: Very High
@colors = (
"#00ccff", "#0099cc", "#006699",
"#ffff00", "#ffcc00", "#ff9933",
"#ff6666", "#ff0000", "#cc0000",
"#990000", "#660000");
$pm2_5 = $_[0];
$aqhi = 3 * 1000 / 10.4 * ((exp(0.000487 * $pm2_5) - 1));
return (
'val' => sprintf("%.0f", $aqhi >= 1 ? $aqhi : 1),
'colors' => [@colors],
'color_idx' => $r
);
}
sub Imeca {
# See http://rama.edomex.gob.mx/imeca
#
# PM2.5 | Threshold | Multiplier | Addition
# Buena | 0.0 | 4.17 | 0
# Regular | 12.1 | 1.49 | 51
# Mala | 45.1 | 0.94 | 101
# Muy Mala | 97.5 | 0.93 | 151
# Extremadamente Mala | 150.5 | 0.99 | 201
# Extremadamente Mala | 250.5 | 0.99 | 301
# Extremadamente Mala | 350.5 | 0.66 | 401
#
# Multiplier * (pm2.5 - Threshold) + Addition
@colors = ("#00e400", "#ffff00", "#ff7e00", "#ff0000", "#99004c", "#99004c", "#99004c");
$pm2_5 = $_[0];
# Table of values: Threshold, Multiplier, Addition
@t = (
[0.0, 4.17, 0.0],
[12.1, 1.49, 51.0],
[45.1, 0.94, 101.0],
[97.5, 0.93, 151.0],
[150.5, 0.99, 201.0],
[250.5, 0.99, 301.0],
[350.5, 0.66, 401.0]
);
# Find relevant row for computation based on pm2.5 threshold
for ($i = 6; $i >= 0; $i--) {
if ($pm2_5 >= $t[$i][0]) {
$r = $i;
last;
}
}
# Compute AQI from raw pm2.5 concentration
$aqi = $t[$r][1] * ($pm2_5 - $t[$r][0]) + $t[$r][2];
return (
'val' => sprintf("%.0f", $aqi),
'colors' => [@colors],
'color_idx' => $r
);
}
sub Ias {
# See https://www.dof.gob.mx/nota_detalle_popup.php?codigo=5576807
# Índice de aire y salud uses the pm2.5 concentration directly.
@colors = ("#00e400", "#ffff00", "#ff7e00", "#ff0000", "#99004c");
$pm2_5 = $_[0];
# Thresholds for color indices
@t = (0.0, 26.0, 46.0, 80.0, 148.0);
# Find relevant row for computation based on pm2.5 threshold
for ($i = 4; $i >= 0; $i--) {
if ($pm2_5 >= $t[$i]) {
$r = $i;
last;
}
}
return (
'val' => sprintf("%.0f", $pm2_5),
'colors' => [@colors],
'color_idx' => $r
);
}
##################
# OUTPUT RESULTS #
##################
# Compute requested value
# Expected return value is a hash of the form:
# (
# 'val' => <numeric measurement value>,
# 'colors' => [<color hex codes>],
# 'color_idx' => <0-based index of color array>,
# )
if ($type eq "US_AQI") {
%result = UsAqi($pm2_5);
} elsif ($type eq "EU_AQI") {
%result = EuAqi($pm2_5);
} elsif ($type eq "CA_AQHI") {
%result = CaAqhi($pm2_5);
} elsif ($type eq "IMECA") {
%result = Imeca($pm2_5);
} elsif ($type eq "IAS") {
%result = Ias($pm2_5);
} else {
# It should not be possible to reach here.
%result = (
'val' => 'ERR',
'colors' => ("#ff0000"),
'color_idx' => 0,
'num_colors' => 1
);
}
# Get color overrides, if any.
if ($ENV{'COLORS'}) {
@colors = split(',', $ENV{'COLORS'});
if (scalar(@colors) < scalar(@{ $result{'colors'} })) {
print STDERR "Warning: number of color overrides is fewer than the number".
" of buckets in type $type\n";
}
} else {
@colors = @{ $result{'colors'} };
}
# Adjust color index if greater than colors length
$color_idx = $result{'color_idx'};
if ($color_idx >= scalar(@colors)) {
$color_idx = scalar(@colors) - 1;
}
# Full text, short text, color
print "$result{'val'}\n";
print "$result{'val'}\n";
if (!$ENV{'NO_COLOR'}) {
print "$colors[$color_idx]\n";
}

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